Here's the Jegs radiator that I have in my Scamp. I'm making low 600hp and I've never battled overheating.
https://www.jegs.com/i/JEGS/555/51930/10002/-1?year=1972&make=PLYMOUTH&model=SCAMP&submodel=BASE
I made a shroud for it out of aluminum and got the highest cfm puller fan that I could fit. Works great and didn't break the bank.
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