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Originally Posted by Jac Mac
Have you actually checked the bore/stroke size of both blocks. The 72 is more likely to be a 390, remember most blocks have 352 cast on the front regardless of actual size. 390 started in 1961, so you might get a pleasant surprise!  |
If the '63 is a 390 as well, I've heard that the passenger 390's from the '60's generally have the thickest walls, and have a better chance to being bored out to 4.13", same as 428, so the '63 block may be a good one. You won't know until you measure the bores of the block, and have the walls sonic tested.