If you are doing an engine build you will find that most LS4 cams are cut for MPFI. If LS4 engine swaps are getting great results its almost certain that they employ MPFI cams that may not lend themselves to carbureted applications.
I don't know what you are trying to do by employing ancient technology, but I can tell you that is a WAY INFERIOR method to engine management. I own some classic cars with a carburetor and the inconsistent way they drive is terrible and so is the gas mileage. A carburetor is a stupid device tunable in a very limited RPM and temperature range. MPFI adjusts for all loads, speeds,climatic conditions, optimizes fuel and timing for lowest emissions, maximum efficiency and engine life. You can scan and tune MPFI with a laptop and easily make changes to the tune.
I don't know what state you live in but in all states and at the federal level, carbureted engines newer than around 1980 are illegal and won't pass emissions tests. Get caught and you will face an extremely large fine. The choice is yours.
" 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.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "