I have a 1973 Mustang and I'm rebuilding the engine. I ordered a new crank, connecting rods, pistons, pins, rings, bearings, cam, etc. I had the engine bored .030. I'm going to be running about 10.35 : 1 compression on stock iron 2v heads. The pistons are TRW forged racing with chromemoly rings(if that matters). I just wondered if this compression ratio will require me to retard my timing or run race fuel. If it does what can I do to reduce the ratio to a safe level without ordering new pistons or heads cause I'm on a very limited budget. Thanks.