That cam is way too big for the 9.1-1 compression ratio. You need to look for a cam that will work with what you have, or swap the pistons for 10.5-11 to 1 pistons to use the cam you listed. Look on the camshaft sites of comp and crane, they have minimum compression ratio's listed for each cam. A comp 270H magnum cam with .015" head gaskets would work good with what you have. Try that with the 180cc Dart heads.