Compression ratio estimates

If the block deck height is actually 9.6" (which is what it's rated at) those pistons should be only .012 in the hole. Most I've seen sit a little lower than their rated though. Using .012 in the hole and combustion chamber cc of 58 cc's and a standard Fel-pro gasket thickness of .039 the compression comes up to 9.92 according to KB's calculator. That would be great for the street as long as the heads are closed chambers. It's a little high for open chambers. Once again I'm not sure what design the 302's are. If their open chamber don't mill the head any more than it takes to get it flat and don't mill the block unless it's warped. You really need to mock up the engine by putting the crank and one piston/rod assy. in to see where they sit in the hole. If it's allot lower than .012 below the deck and the heads are closed chamber style you can have it decked. If it's close leave it alone and only resurface the heads. Remember to take off .009" on the intake side of the heads for every .010 you take off the chamber side and your intake will line up. It will let the intake set lower when you mill it so when you install it don't use the cork end seals, just silicone it up.