Quote: Rule 201 c. A correct* 327 Chevy can use a 350 or 400 block, if it appears externally correct*, and is made from the correct* material.
I think this falls in the "upon a cursory visual inspection by someone reasonably familiar with the year, make and model claimed, it looks like a correct* part"
My guess is that an extra freeze plug, a different shape accessory boss, a slightly different timing cover design, etc would not be considered out of spec for the rule.
This would also apply to a Mopar in the case of a 340 Restoration block which is a heavier duty casting (like 50lbs heavier too!). The casting number is correct/vintage but the sides of the block castings don't look the same in many areas. Or how about the guys running a mixture of correct and incorrect carburetors, head castings, and exhaust manifolds for the year/model car they run. Lot's of "Grey" in how the current FAST rules are interpreted or enforced.
