A hughes whip lash cam should work real nice and yes I would use the 516 heads if I had them sitting around ready to go. A lunati Voo-Doo or comp XE cam would be good also. Something in about the 220@.050 lift range would be about right. Those heads don't flow great so getting the valves open as fast as possible should help get it flowing at it's peak sooner and longer.

I am not causing global warming, I am just trying to hold off a impending Ice Age!