The gasket alone with a flat top piston having 7 ccs in valve clearance notches would range at 9.9 for the thin gasket 9.6 for the medium 9.1 for the thick gasket. Added to this is the thickness of the head gasket which at a minimum is. 025 inch from the edge of the piston crown to the deck. Assuming the block is not decked nor heads milled and the pistons have the standard GM 1.56 inch compression distance (center of pin to the crown edge, there are rebuilder pistons that use 1.54 inch and certainly other combinations of rod lengths and pistons) then there should be. With the 193 heads flat tops are iffy but this is highly dependant upon the head gasket and whether the block has been decked or the heads milled. These numbers will about mid head between valve springs.
So before you go very far you need to know which heads are yours.
The head casting ending in 191 is a low compression 76 cc head the casting ending in 193 is the high compression 64 cc head, the short block rotating assembly uses the same piston for both engines. The Swirl Port engines use two different heads.
