Not Ranked
Ohbouy,
According to groups like PAW and Probe, better than 50% of the 351W blocks they seeare unusable. This is not to infer that the 351W is a bad engine, just that many of the ones that are available arein bad condition.
I would recommend that you buy the engine from a reputable builder that has had the block magnafluxed and sonic tested. Both PAW and Probe will sell you a block that has been tested.
Finally, buying off of eBay is OK but it is the ultimate state of 'caveat emptor'. You can't see what you are buying, and when it arrives, its yours. If you are buying the engine out of state, the shipping costs alone could cost more than what you could find one locally for.
Brad
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