Your lookin at 65 hp per hole ,that hole is probably down 20 to 30 hp from the colapsed lifter at the most ,................I have a hard time believing that the stock pistons were a correct match for those heads and camshaft.
1 point low on compression could hurt you just as much if not more than the colapsed lifter,that means your actually 2 points low ,because you have aluminum heads.
I am thinkin that cam calls for about 10.5 to 1 and I am thinkin you got 9 to 1 at the most and then aluminum heads on top of that.
Think of what the performance would be on a engine with 8.5 to 1 and a cam in there that calls for 10.5 to 1.................I may be off base,but I recall most of the kits I looked at recommended changing the pistons to match the heads and cam,very few were for factory stock motors.