3in blower pulley 2-belt belt size? dyno for 6psi also!

Hey there, I ordered a 3in blower pulley for my 2-belt novi 1000. Im gonna leave the stock crank pulley on there for simplicity and cheapness for the time being. But i was wondering what size belt i would use with the new blower pulley ? i want to wrap the belt around this pulley as much as possible to avoid slipping. Also does anyone run this combo ? if so what kinda boost are you seeing and are you satisfied with the combination ?

i squeezed 398rwhp and 376rwtq. with the 6psi im at now with a bone stock explorer bottom end edelbrock heads e-cam explorer intake and power pipe with 10degrees base 25deg. overall timing. any expectations i should have ? any tuning tips ? i have hyper pistons so i think conservative is the name of the game specially in florida heat

Thanks, Ben