Right now Im running a Comp Hydraulic XE 275HL in a 440 with Speedpro 2355 pistons (9.7 comp) and HP exhaust. I used this cam because of the restrictions in the exhaust.The car ran mid 12s through the mufflers with this combo and a 3200 stall convertor and 3.91s. Im putting the 2 inch Proparts headers on the car now so it can breath. I want to go mechanical. The motor has Mopar 1.6 roller rockers on it. I was thinking of the .557 MP or the Racer Brown ST-21. Any thoughts??