I'm no expert on this, but think that blower might be a little small for a 383. Since you have a blow through carburetor, maybe consider a centrifugal supercharger from SD Concepts? They have parts in stock to bolt up to your 383

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"