Measure need from crank pulley

[FinnCobra]

I'm making custom drive for my Eaton swap. Friend will make me lower pulley for supercharger belt. What is the dimension from pulley to timing cover? Or hub dimensions if someone has one separate for measuring. Pic attached

 

[FinnCobra]

got already

 

[aarons04cobra]

post up what it ended up being

 

[FinnCobra]

Two similar engine combos. First was 1.8" between belts, another one 1.69" same measure. I trust more the later one, but I'm not sure. I have to drive break-in drive for my engine, and I'm doing it without charger.