Questions, question, questions.....

[gmiles]

     New to this board. Anyway, great info in here. I read all the posts about AC and had most of my questions answered before I even joined.  But I have some more questions. I was given an unfinished project: a 74 C10 Stepside 2WD. Pearl white with ghost flames. It was a theft recovery and had almost everything missing. I picked up a 75 3/4 ton long bed and am taking most of the stuff I need from it to build the 74 Stepside. Here are my questions.

[gmiles]

1) the 75 has some type of switch on the gas pedal mount, what's it for? Do I need it on the 74?
2) is there  something on the carb'd trucks that boost/offset the rpm when the AC is on? My new engine has an Edelbrock carb on it
3) how much shorter is a Stepside driveshaft from the longbed?
4) the 75 had AC and next to the AC box in the engine compartment was a black canister. Is this the "reserve vacuum" canister?
5)

Thanks in advance. I'll have more questions as I get to building. I've already swapped out the power steering and power brakes onto the 74 from the 75.

Grady.
happily building hotrods in SoCal

[dumbucket1]

I can answer the switch on the gas pedal is probably the kickdown for passing gear for a th400 trans.

they had a solinoid that raised the rpms when the a/c is on.

can't answer third question sorry

I don't remember what that canister does.

[VileZambonie]

Yes the switch on the gas pedal is for the detent solenoid used on TH400 transmissions

There are several ways you can boost idle to compensate for engine load - look for an actuator on an old q-jet and just wire it in parallel with the ac pressure switch

A short wheel base truck will have a shorter driveshaft but the trans/transfer case set up will determine the length.

That black ball is your vacuum reserve canister