Another option may be to look at what @GA Architect, Rick did on his ‘77. He used a fan run with a switch and timer with good results. Makes a huge difference on my ‘78 when in the Mtns in the summer. I know Rick has gone FI now but I bet he will share with you his former setup.Carb cooling fan has decided to go on strike and while I don’t believe it to be an ‘essential worker’ - I do think it helps it warm weather! I am not gifted in diagnosing electrical issues but can change out parts so....... I cleaned the sensor good then tracked down a replacement cooling fan computer thingy as well as a new relay. Didn’t get to test it out today but hopefully the carb will get a nice blow job tomorrow
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