Yes, the earrlier head interchanges, as do the ones from 194 and 230 engines. I believe the 194 has too-small valves to be considered for the 250, but the 230 head gives a 250 a nice compression bump and still has fair-sized valves. One trick I like to use is to replace the dish-top 250 pistons with 307 V-8 pistons. They're a drop-in swap, same size, weight, wrist pin diameter, compression height, etc.
Jerry
