This won't specifically answer your question, but may help.
I have documented three '73 4-speed SD Trans Am's with their original 3 core radiator. One is a 12k mile 4-speed, non air. Another is my 32k mile 4-speed, non air. If you didn't order a/c or HD cooling, you got the three core radiator along with the 114 fan shroud.
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69 GTO 400, 4-Speed, Matador Red
69 SCJ Mach 1 Mustang, 4-Speed, Drag Pack
72 Trans Am, 455HO, 4-Speed, Lucerne Blue
73 Trans Am, SD-455, 4-Speed, Brewster Green
73 Formula, 455, 4-Speed, Ascot Silver
73 Formula, 455, Navaho Orange Survivor
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