On your 350 question. A 350 block is a 350 block. The casting is the same. On the newer 350 the Heads cc's are probably not as effective so your compression will be lower than that of lets say a 69 block. You can change all that yourself. For the block though it is the same thing. If you change the internals you can make the engine anything you want it to be. Dont get all caught up in the 2 bolt main and 4 bolt main arguements. Either one is good plus a 2 bolt is usually cheaper to buy. The 80's block would be just fine to build.
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