That setup is shown in a video on You Tube. The guy did a really good job fabricating the supercharger mounting and a drive system but I was never enthused about having a 70 cu in capacity supercharger on a 300 cu in engine. There would be boost but not real efficient use of the small supercharger. Way to go on a 4.9L would be with a properly sized turbo. Years back a guy from Canada by the name of Pete did this and the Fiero ran 12 sec 1/4 mile times which were excellent times for a Fiero.
If you have a 4.9L Cadillac swap, its already decent fast. With some head porting and a Delta cam, performance should be excellent.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "