nothing but issues after having Metco 4lb lower installed...help with correct belt?

[KBR]

I'm curious as to what pulley you used on the roush tensioner? When I upgraded to the roush part I wanted a metco pulley, simply to match the rest of my pulleys. They said they didn't have one that would fit.
I assume you spaced the roush tensioner correctly? It doesn't just bolt on, it needs spacers

I used the Metco pulley with the spacers in the kit plus washers to shim the tensioner.

photo from a friends car who did the same thing.