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If you still have cooling issues, you may need to consider a good 2-row aluminum radiator, one with 3/8" tubes. That, or widening your radiator support opening (Google "mustang steve radiator support") for a wider radiator.
After having so many cooling issues and now spending a few thousand $$ to rebuild the engine, I'm basically paranoid of overheating so I'm ordered one of these: https://www.speedcooling.com/1964-19...AN-289-V8.html
I'm not super happy that it is aluminum and won't look as original but I'd rather look a little less original than deal with overheating issues again.