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Anyone know where to find a fitting to go from the 20mmx1.5 o-ring that the radiator takes to 8an or 10an?

I've tried asking on another forum, but all I get is "don't bother" answers. Thought maybe you all would more help, even if it naturally aspirated. I have two blocks, an early, fuel pump boss, 4 barrel carb'd block, and a 97 balance shaft block. Here's my thoughts: Old block with new heads, or...