Hi Andrew,

I'll probably run the blower set up with the 390 at first, as I know it's a good carb. I bought it new and have gone through it with a QuickKit. The manifold is from TR Designs. Tom Roberts has worked with Magnuson to design this lower manifold that bolts to the flathead. He also offers upper manifolds for carbs and blowers. He makes one specifically for the Magnuson MP112C. I have that blower which is designed for a 4 barrel. The upper manifold I picked up off ebay is basically a flat aluminum plate that I have to drill and open up for the supercharger. It is designed to be able to accomodate various types of blowers, so it's pretty generic in shape. I'll try to figure out how to load pix on this site later tomorrow and then you can see what I'm talking about. Later!