According to this site, you could very well have a 9.480 block
http://www.cavalryoffroad.com/SBFenginespecs.html
notice the remarks section for the D2AE
Quote:
YEAR CASTING BORE DECK REMARKS
1971-74 D2AE-BA
.............D4AE-DA 4.00" 9.503" 1971-73 deck height is 9.480"
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351 blocks are really a dime a dozen! Go find a new block. Of course, then you have to pay for all the machining again, but you might be better off? find a 351 out of a 94+ truck and you've got a roller block and can now run roller lifters rather than flat.