Hi welcome aboard!! As far as the 350 goes, i personally wouldnt go and use ALL junkyard parts. the block and heads are cool, maybe the oil pan if it isnt all dented and smashed in. but as far and the internals, if i was on a budget i would at least get the crank cut and polished, the block bored and honed and the heads rebuilt. Thats a couple hudred bucksthere, then to pull out 350 horses out of the 350, when the guys are doing the machine work id have them do a 3 angle valve job on the heads, get a set of 10.5:1 FORGED trw pistons (trw's a little less expensive) a good
cam, something by crane or comp cams. something with like no more that about 500 lift intake and about 520 exh and the duration should be about 292-300 degrees of duration. max. and a decent set of headers, which nowadays is a pretty inexpensive investment. you never mentioned the trans type or what the motor is going into...trans type is very important. Oh and the intake, performer RPM intake with about a 650 holley vac secondaries, check ebay: http://search.ebay.com/small-block-c...jsZ1QQfromZR40

I find some really really good deals on there. and for parts like the timing chain, theyre cheap enough where you dont need to use junkyard parts you can get them new for less than $40 let us know how it works out Good luck, later,Joe