Eaton M90 or Eaton M112?

Ok, so now that I'm getting my 74 Duster back, I plan on going forward with the supercharged Slant 6 (225 Super Six).
I've got most of the important parts figured out, such as the lower pulley (Slanty's can use Chevy 3 bolt crank pulleys), I've got a manifold design going, and the location of the fuel injectors figured out.

But before I finalize the manifold design...
Should I use the Eaton M90, or the M112?
Or do you more experienced Mopar guys have a different Supercharger suggestion?

And yes, I really want to go with a blower. Turbos are cool, but I plan on auto crossing the Duster, and I want the blower for low end torque. Plus I think its better, considering max rpm stock is....4500 I think?

I'm open to any info you guys can give. I'm still in the research phase.