68 Dodge Dart with 440 Cooling recommendation

did someone say to get rid of the flexfan?, if not then I will;
get rid of the flexfan. In my experience, they are horrible excuses for a streetfan even up here in igloo territory

and seal the carb to the hoodscoop so the engine cannot try to be a runaway nuclear reactor.
If the engine is forced to ingest ever-changing temperature underhood air, you cannot control the AFR. So the engine may be lean at low roadspeeds, may be fine at some mid-speeds, and may go rich at higher speeds. Guess what that does to your EGTs...... and the water temps.

Running this way, I was able to underdrive my hi-flo waterpump,so the belt stays on at 7000plus rpm,and
run a Thermostatic fan-clutch,and
continue to run an ancient factory 318-A/C rad. And,
she now runs at 207*F rock-solid, so my advance curves can be right on the edge, and the carb holds it's tune.And I mean 207 rock-solid no matter what the ambient temp,or how hard she's working, or how long she has been idling.
I am reusing the 7-blade factory all-steel, high-attack 1973 318-A/C fan, with a Ford T-clutch, off a late 90s/early 2000s pick-up truck. Trouble free since about 2001. In fact, I don't even have an aftermarket Temp gauge, and there is not much point monitoring the slo-poke factory one....... so I don't. Instead, I run a 7psi cap. The idea being the cap blowing off will be my tell-tale. It never has.