I have a 350 on a engine stand that's from a 79 Chevy wrecker that the PO said was a high nickle content block, whatever that means. I guess making up your mind between building and engine (which can be a lot of fun) but risky or having a crate engine which does have a warranty is the 2 factors which have to be weighed in making a decision. The older engines have 2 piece rear main seals etc.
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Richard Dobson
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