174/177 supercharged small block, where to start?

dodgy said
Mopardude318, what size belt did you use when you changed to the 2.5" pulley, ran my 144 today, and like yours it didn't register much on the gauge maybe 1.5 psi, swapped over to the small pulley but need a shorter belt.

I used this belt here, see picture. It is still a tad too long I have my belt tensioner adjusted all the way out and to the left.
I can give that PN to the parts store and they can spec me the next shorter one.