174/177 supercharged small block, where to start?

I tried a belt 1” shorter. Does not work, too short, even moving the tensioner bracket all the way over, which I found creates another problem…

The trouble spot I found is that the top pulley being 2.5” diameter, I think makes the travel of the belt by the tensioner very close, too narrow. There’s not a lot of room to move the tensioner over to the other holes before the tensioner itself contacts the belt...LOL… what a frickin riot.

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