Cooling Issue - 1964 Dart GT - 273 with automatic and A/C

Dart5150 said

Very nice engine bay you have there! Thanks for your input. The gauge operation tends to correctly follow conditions, using an IR thermometer. But validation with an aftermarket gauge may be a good idea. Can you recommend one? Also, where did you find your stock radiator, or is it original? Are the mounting points the same dimension described above? About 21.25" on center? Water pump is building pressure and you can see flow in the radiator, so I made the assumption that that wasn't an issue. I'll revisit timing and carb lean/rich settings. Can you elaborate on the slipping converter/trans?

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1) almost any well known gauge manufacturer will do. Since may or may not stay- less expensive with a sending unit is best.
2) that is the stock radiator in my car. I can get you a part number off the top tank - pm me for it. I had spent the money and had the radiator completely redone by a radiator shop near me in CT for about $650. This was after the aluminum radiator from cold case failed to do the job. I also did not like the look in my car all square and aluminum as my car was built to look like what you would find in 1968-69 of a modified 66 Barracuda.
3)trans / converter slippage- basically a slipping converter (getting worn out) generates extra heat, slipping trans or “sloppy” trans allows for more heat all dumping into the radiator. So even if it adds 10-15 degrees more…. It’s 195-200 instead of 180. I’m not sure how fresh your drivetrain is but if it is getting tired, that could be some trouble.