Just to throw it out there, I have one of the early run IA2 iron std deck/bore blocks, and to go to 4.350 bore, it was recommended I sleeve two bores, which I did. I will see if I can get more specific info regarding, but that block was one of the 'prepped' blocks ready to assenble from Butler. It would have been fine at the bore it was delivered as, but it was one of those 'better not take the chance' things for me. (going to a larger bore)
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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