174/177 supercharged small block, where to start?

Ok, I got 5" from the front of the harmonic balancer to the front of the lower blower pulley. 6rib and due to different harmonic balancers, I will give you some more dimensions. I am running a 2 groove March aluminum crank pulley.

My snout is 9.75"

From the center of the front driverside intake manifold bolt to the front of the upper blower pulley, I have 8 1/8"

IDK, you might be able to open up the crank pulleys inside diameter and reduce the blower pulleys outside diameter to let them fit inside of eachother?