Smallblock Heads Help

Hi there i was just wondering if someone could help me out here...
i have a 360 LA engine with these specs .. 9:8.1 comp. standard style cast heads with minor match porting to the edelbrock rpm manifold, it has 1.94 inch inlet with 1.60 exhaust, open chamber heads 62cc..i am running the 280 h comp cam. and a 650 d/p hp street carb.. goes quite well, but was wondering if i put a set of heavily ported j heads with 2.02 inlet and 1.60 exhaust valves on this bottom end would i loose torque with the 280 h combo? i also have a 750 mighty demon laying around at home too...cheers Daniel