Between the compressor discharge and the manifold will work, but it's dangerous - full of combustible mixture, and a bad spark setting, hung valve or backfire will explode everything including the blower case. The usual compromise is to have only air enter the blower case (GMC: on top, Eaton: in back), and the (pressurized) discharge pass through a remote intercooler (has to be in air stream, usually ahead of the radiator) which then supplies a "hat" over the carburetor's air horn. The bottom of the blower case can end in a simple box covering the whole bolt pattern and ending in a big tube passing sideways (to avoid the blower drive) then forward to the cooler. A cheap intercooler is JY stuff or Chinese on eBay, some factory diesel coolers work OK. The piping to & from the cooler is typically 3" aluminum tube with rubber sleeves and screw lamps, no rocket science. A Holley, Carter etc. 4 bbl. with the usual 5-1/8" top on a Clifford etc. 4 bbl. manifold will do nicely. It could blow through 3 X 2 bbls. but lots of extra work and you can buy all the 4 bbl. parts including a carburetor set up for blow-through.
It won't be as pretty, but more power with the same boost pressure.
