Odd Dodge

I would think that you would need to port them like any head from that period and put in the larger valves. And you would need to see if you want a open chamber or closed. But back in 72-75 those were the heads to get and modify. Look in the older Mopar racing manuals of that vintage. The 66 and earlier had the smaller valves and a closed chamber. 67 and up were the best choice.