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I have one that is cast and a two hole. I think what you are looking for is pressed steel and three holes?
I'm sure I have one of these idlers. I don't know if there are differences between 68, 69 and 70.
Should be a 3 hole steel. I think the 2 hole cast would be for a small block, at least that's what is on a '68 GT350 that I'm working on also.
Mansfield shows they have a NOS C8AZ-8678-B