Another overheating situation 63 Slant six

Check the fitment dimensions on an early Mustang aluminum radiator in that 63. Probably a few more out there than early A Mopars but mine fit my 65 A with just 2 mlre holes drilled in the bracket.. Valve adjustment....always a good starting point on a solid lifter slant. 6 plugs and a can of Gumout shot into the carb at a fast idle.