I feel the biggest improvement you can make Bob would be the radiator at this point and then go from there.
I've run 4 core coppers in everything here. Out of all of them, I switched 2 of them over to aluminum radiators and they both showed a substantial cooling improvement with no other changes. I'm talking about a "good" aluminum radiator that comes with 2 rows of very wide 1 1/4" tubes.
Dad's car was no different. Switched that one from his 4 core copper to the aluminum and it's a good 20 degrees better than the best temps we got with the 4 core copper.
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