Which heads?

ValiantRacing said
Don't use the 273 heads, ports and valves are WAY to small.

Added correction within quote.

Plymouth 65 said
Use the 360 heads have them milled and use the thinnest head gaskets you can buy. 65'

This ^^^^ is the cheapest way to enhance the head and set up.

Stay with the 360 heads. Milled or not.