you should be able to get it into the 9.25 to 1 range fairly easily with flat top pistons, zero decking and milling the heads about .030 -.040. I am working on my '72 455HO motor and when I measured the heads (which appear untouched), they actually measured closer to 106-108cc's so with a little milling they will be in the 100cc range.
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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