1976 suburban 454 20over steel crank stock truck rods flat tops steel nos head gaskets 702 heads extreme energie cam 224-230 at 50 515-520 lift performer rpm intake 3310-1 vac secondaries what kind of hp and torque just broke in on stand sounds real mean running 12 intial how much total should i run no vac advance and is jetting close 72 primary 76 sec