Hemi heads on a poly?

I can put a set of the small Hemi heads on my '56.... It has a 270 (Semi-Hemi) Red Ram Poly in it. I know it's not as easy as just bolting on the heads. By the time I would go through all that I might as well do what I want to.... 440 strocked to 500" with a 5spd behind it. Hey, that cars heavy... I need the torque. lol