Ha-ha nail on the head with not having built this engine and already planning another. I had build plans for the 363 then when my DD motor crapped out, i got screwed. Some of my info might be mixing with the 363 and what I should do now.Honestly, i don't know how the engine will react to that SC and a larger head.
I was more or less taught that you use the right parts for you now, not for an unknown future.
Those heads appear to be about $1600 a set. Considering they are best for a stroker and you are building a 302 or 306 me personally, i wouldn't use them. It's almost like you have haven't even built this engine and you are already planning another.
I'd save $500 and buy the TW's. Then if you need them larger you send them to TEA for CNC'ing.
That radiator should be fine, i wouldn't worry about heat. The supercharger may heat up the intake air and the SC itself, but that doesn't necessarily mean the engine is going to run hot.
Heat soak even happens to intercooled Roots or twin screw blowers, so it's nothing out of the ordinary on a pushrod roots blower.
Alright, I was under the impression that the heat soak would be so tremendous that it would be killing my coolant temps. I found another local machine shop I'm calling today. Dixie Performance.