A good shop can fit straight 4 bolt caps with the original block holes, it's just 'preferred' to start with a 2 bolt drilled block since there's less work/checking on the caps.
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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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