70duster 360 gets hotter the faster i go

"BTW1, Your temp sender. Where exactly is it located?
BTW2 manual control of the fans, is inviting disaster at the worst, and premature engine wear at the least.The engine needs to get up to temp as quickly as possible and stay there. Not shuttling between too hot and too cold. I would change that to automatic control asap.
BTW3 Have you heard the expression "cutting off your nose to spite your face"? If you are going to spend a very significant amount of time on the street, you absolutely need the V-can. Once its tuned,your engine will have more driveaway,and lowspeed torque,run smoother,quieter, cooler, and get waaay better fuel mileage. The gentle tip in will be much more responsive.
And do you recall what the Mopar dizzy specs were?Typically they are a 20* sweep and all in by 3000 to 3600, and with a 20*can on it. This is more or less what I run.But then Im tuned for 87E10, and rely very heavily on the V-can.
BTW4 did you catch Tylers post#13?
Yeah I know youre almost married to what you got now. But one day you will begin to wonder.And Ill be here for you. Unless Im dead. Or they boot me off.

I hope im replying to all this right... With cap off rater runs threw radiator pretty good, no white caps or nuffin, but its flowin (mayb like garden hose half on)...

The temp sensors are right by thermostat, drivers side has aftermarket mechanical gauge, pass side has stock sender for gauge in dash...
As soon as i get it to run cool, im gunna put in the temp sender so fans are on at 180, off at 170
Core support is not cut open, its only about 1.5" on both sides id have to cut out
Im about to take it for a spin and see what the temps read