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It is the best possible radiator you can buy for your '75. It will fit exactly like the original in every regard. You will not have to do anything to it or the car or make any adjustments. It will even look the same, only in aluminum.
I had very good results installing the DeWitt radiator. Still in the process of connecting the electric fans. DeWitt installed the temp sensor in the L tank under the upper radiator hose. I also ordered the new rubber saddles, and a seal,might as well. My 73 was orange, think I will go with that color. Yours looks sharp!
I put a champion in my 74 and it dropped right in, no mods. With dual electric fans and aluminum shroud it stays right around 185 deg F at idle on a 90 deg day. Never used Dewitt but everyone seems to love them. Just thought I'd chime in with an option.