Scrapped my plans for 421 stroker sb and 496 bbc, machine shops are too busy around here. Picked up a Gen 3 LQ4 6.0 complete for $600. Has about 150k miles on it. Going to go with a intake, carb, cam and nitrous plate.
George, My old Chevelle is long gone, and in the past 2 years there were no less than four temporary replacements.
Currently, a 2000 Trans Am...LQ4, 4L80E, Ford 9" rear...
Race weight is 4005#
WAS, a turbo car when I first got it, but like you have said, as a bracket car, it simply doesn't work.
I have since removed the turbo setup, swapped out the "turbo spec'd cam", and added longtube headers and a 3" single exhaust, back to a 2.5" dual outlet muffler
Anyway, I chose a simple, cheap camshaft...Elgin E-1940-P, aka the "Sloppy Stage 2" 228/230 585/585 112lsa
Torque converter is still a way too tight turbo spec'd triple disc that works good with nitrous, but horrible without..
Anyway, I have a basic combo, in a heavy car, with a wrong converter...lol
On a Mustang Dyno (supposedly reading 10-12% lower than a Dynojet), tuned by me, made 348/356 to the wheels, N/A...448/442 with a 150 shot, and 504/520 with a 200 shot.
Again, with the WRONG, too tight, converter, car goes 12.20's at 112-113 N/A, and has been 10.69 @ 126 with a 150 shot, carrying the front wheels. Good air would probably mean 10.50's with a small 150 shot...My Nitrous Outlet setup can make 400hp.
Not even taking into account, the ridiculous drivetrain losses I have (with a 4L80E, heavy triple disc lockup converter, steel driveshaft, and Ford rear with a Detroit Locker), I'm sure with CORRECT converter, and a proper launch, it would easily meet or likely beat your "mud motor" times, and the nitrous times already do quite easily.
I think you'll love it. Good Luck!