Yes, quench is very important if you want to avoid detonation. If your block is stock with the pistons .025 in the hole, you will want to find a head gasket with of thickness between .015 and .019 for proper quench. And you should be sure to find out your DCR with the cam you are considering. You will want to keep your DCR under 8.0 with iron heads if you want to run pump gas.