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The best advice I can give, is find one that can be rebuilt. Its kinda hard to tell the condition of an engine from the outside, but regaurdless, Id plan on rebuilding it. I can tell you the number of late model camaros and firebirds Ive seen lately that are smoking. I can find them running around here for $200-$300 dollars, but wouldnt put one in until I rebuilt it. Its too much trouble to put one in just to have to pull it out because it smoke like a freighttrain. Unless you can see it run before you buy it and verify that is runs good, rebuild it. These engines a cheap to rebuild if you want just a basic, good running, reliable engine.
Well, the cranks are balanced differently because the 350's pistons are larger diameter than the 305's.i'll try to dig up the link. i mean, technically you could use the crank out of the different engine, but it will shake bad.
Jimbo, why do you want to change the cam? That cam has slightly less lift than the stock cam.
Go with the 1102
For your 305 the 1102 is your best bet.