cooling

200*F at the top of the rad, is NOT too hot. 220* would be a little dicey, unless it never ran over that.
My math puts your displacement at 374 cubes, and with 11.5Scr, and with aluminum heads. I hope your TB is getting fresh cold air.
And you have a high-flo pump, and a stat restrictor,and a nice new rad.
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Well my combo is a little tamer than yours, for sure. Probably 430ish hp.
I have the pump and heads, and 10.7 Scr. I also have a 42 year old pos rad, and a 7 blade all steel fan, mounted on a FORD thermostatic clutch, a 205 Stat,a 7 pound cap,a shroud, and fresh cold air.
My combo cares not a bit what the outside temperature is, or what the engine is doing, or how hard I'm pushing it. The temp gauge behaves exactly correctly, and once warmed up, it never moves.
Besides 70 WOT horsepower, and a hair more cr, what's different? A part-answer is in post #10.
On a lighter note; maybe your pistons or rings are too tight.....
Sometimes you have to lose to win, back-up to go forward, say nothing to speak volumes....