Need A Recipe For A 273 Rebuild

Might want to look into a set of 302 heads from a mid-80's 318. Yes, they they have smaller valves, but they'll raise your compression ratio significantly and there's less valve shrouding than with heads from a larger-bore engine.

I consider a 273 a straight up hot-rod engine - solid cam, steel crank, floating rods, high C/R... 360's never came with any such equipment!