75 Truck - Engine dies when hot

[Alanc]

Looking for ideas, recently bought a 75 c10 that had been sitting for a few years and was revived (not by me) earlier this year and has about 1000 miles since being revived.  It has a stock 350 engine (believe with 91000 miles), a 2bbl carb and TH350 auto trans.  Now that we are into Kansas summer (100 degrees) the engine is cutting out / dieing when hot.  When cool or on cool days it does run pretty well and doesn't seem to indicate any issues, so appears to be heat related....

Typically engine just dies, sometimes sputters, most time it just flat quits.  Sometimes it will 'restart' itself and sometimes I will have to pull over and restart...which it will typically restart immediately and doesn't need a 'cool down' period or cranking to refill carb with fuel - plus one time when it died a friend riding with me jumped out and looked in the carb as I pressed the accelerator, fuel was present so that made it appear to be an electrical problem rather then fuel delivery...

So far this is what I have tried: 
Tested fuel pressure and is good at 6-6.5 pounds.  Though it does not appear to be vapor lock since it just quits without sputtering and will typically restart right away, I did try wrapping the fuel line with foil and attached clothes pins - no joy.  Also note Previous owner did install new fuel tank and fuel pump when it was revived. 

To test/eliminate ignition switch/wiring I have made (2) tests: first I attached a volt meter to the 12volt input to the distributor and input voltage to the distributor never appeared to drop through the engine stall.  Then I jumpered the coil positive terminal directly to the battery positive terminal and again no change in behavior, which would seem to indicate issue is not in the ignition switch or wiring to the distributor.  So, then thinking possibly a coil or distributor issue (HEI system), I swapped in a complete spare distributor/cap/coil a friend had and again no change.  So that would seem to just leave spark plugs/wires on the electrical side, but that does not seem likely as it doesn't start missing or sputtering, just stops completely?

What is left?  any carb issues that could do this?  Ideas or other questions??

[Irish_Alley]

im 99% unfamiliar with point or their set up but does it still have points or has it been converted over to HEI?

[Alanc]

it is HEI, I believe 1975 was first year of factory HEI.

[zieg85]

Check to make sure the rubber lines are not kinked any.  I have seen this a lot especially if the work is done under the truck without removing the bed.  Usually the lines are left too long and get a kink in them.

[81GMCBILL]

consider yourself lucky if its getting too hot and shutting off. keep an eye on your temp gauge - you dont want to blow a head gasket - like I did. sounds to me you need to check everything that has to
do with the cooling system or fuel line filter or fuel line lockup.

[Irish_Alley]

dont think hes saying hot like over heating just operating temp, are you alana?

[Alanc]

Thanks for the replies, some feedback:

zieg85: Visually checked rubber fuel lines from tank to pump, no kinks or obvious issues, rubber hose looks newish, metal pipe sections do not. 

Irish_Alley / 81GMCBILL: No, engine is not overheating, at running temp on a hot day + stop and go traffic seems to bring this on. 

[jaredts]

If it is hei it could very well be the ignition module.

[Alanc]

jaredts:  That is the one part I replaced with a new part...then tried an alternate distributor in its entirety without success.

[Irish_Alley]

does it die only when driving?  coming to a stop, taking off or at idle does it also have the same problem?

[Alanc]

Typically is while driving, maybe more likely under some load accelerating but not necessarily right off idle, has not stalled at idle. 

[Irish_Alley]

do you have another carb you can swap on?

[Alanc]

Have a friend trying to run down a carb to test with...

[Irish_Alley]

does it smoke or anything while its stalling out, like its getting too much fuel?

[Stewart G Griffin]

Would float level (too high or too low) cause this?

Also, the pickup coil's wires (these move from vacuum advance) might be bad.

i'd like to start a project, when i get around to it, that lists all probably causes for  problems starting from simplest/most likely to less likely.