Forced induction makes gobs of torque. If you don't load it down, it won't make as much power.
It'll also make so much power with a higher numeric gear that it'll be harder to get it to launch without blowing the tires off.
I'd run a pair of 1050s on it, if you can afford it. If not, run the biggest (950?) of the HP Holley series. You can not put too big of a carburetor on a blower, but you can put too small of one on. Too small of a carb will put excessive vacuum on the emulsion tubes, which will make it much harder to tune and empty out the fuel bowls much faster than required.
Hell, 12 years ago when we were running the old motor, there wasn't a darn thing special about it. It was a 5140 crank, L-88 steel rods, and I think the same pistons you have with a 119CC open chamber rectangle port. We were just using stock Fel-Pro BBC head gaskets. Nothing special at all.
If you go to my website (
www.onebadgmc.com), Videos 1/2 were with oval port GM heads (049 castings), with a 1020 CFM Gas carb. It was running mid 10s with 7 PSI.
Vids 3/4 were with my home brewed mechanical injection, made from Enderle/Hilborn parts. That was with the rectangle ports and 12 PSI on alky.
At that point, the truck weighed 3700ish pounds.
Passes 1 through 3 and "Boom" were with the tube chassis (3450 Lbs race ready with me in it), and my 505 with an Enderle Buzzard hat, 11.5:1 compression, 22 PSI, 10-71, and the same rectangle ports off my 462. The 505 dynoed at 1200 HP at 18PSI with the old 8-71. I have no clue how much power it made at 22 PSI with the 10-71, but it ran pretty damn good until I leaned it out and blew a cylinder wall out.
This year we're moving up to a 568, with a 14-71 SSI blower, Dart 360 heads, and a magical Jim Oddy .820 camshaft. Oddy's says no BS it should make 2000-2100 HP if properly tuned.