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    Early 80s 355 or 383 T.B.I crate engine

    Preparing to replace the motor in my 94 GMC 1500 and I need some advice on which route go go. Option #1- I have a pre 87 four bolt main block, already .030 over, internals have been balanced and appear to still be in great shape, has a set of Worlds 1-037 heads. Clean everything up and put back...
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