273 head choice ?

I don’t know how the the early 234 head ports compare to the 234 industrial 318 heads, but the industrial head ports look immeasurably better than 302 casting heads. My machinist confirmed that he can block the water crossover on them. They look like some 11/32 stem 1.82 (305 Chevy) /1.60 exhaust stainless valves and some porting could make them very good for a 273.