It's a lot milder than it appears, the blower is mostly for the look. I'm hoping to get away with a stock style radiator. I asked my engine builder (me) and he said to give it a shot and see what happens
I can always go back and cut it up for a thicker radiator in the future as needed.
It looks like some guys are using a 73-87 radiator, but looking at pics online I can't tell what is different about it than my 68 rad.