Not just any shop can get you into a turn key 800RW motor / driveline setup with a itemized recipt
I would bet that FLP has a strong back bone for any odd items that could arize post build / install.
FLP's quote is not out of line in my opinion,
LT1 PCM 2bar Speed density
setup will support accurate fueling and spark
that is scaleable and accurate from 30" vacuum to 15.5 PSI
the 2bar map is like $80 on summit an $5 at the salvage yard
the labor and time to get the VE table razor sharp is not a 1 hour deal like a normal Dyno MAF tune.
I see no reason that a 383ci LT1 @ 15.5 PSI could not make 900RWHP+ thru a T56
Real world examples of good power on 2 bar LT1 I have personally setup and tuned:
750RWHP single turbo 355 LT1 @ 14 PSI thru ProBuilt 4L60E
650RWHP / 850RWTQ on a Joe Mejia built D1 383 LT1 @ 11 PSI radically detuned thru FLP 4L80
450RWHP 450RWT fully stock long block 350 LT1 V2 super charger @ 10PSI thru T56
Last combo is getting redone soon w/ Joe Mejia Built 383 Trick Flow AI heads custom cam at Vortech YSI @ 25PS1
The big picture A is:
800RWHP motor in a stock Impala SS
is 100% going to blow the tires to liquid from a dead stop launch
side ways at 100MPH joke
and thats if you dont break anything in the drive line
then you have to stop it if you dont bounce off a K-rail first
The big picture B is:
streetable 800RWHP motor and driveline that is working great driving like stock like a new LS9 ZR1
dyno tune is all done, and it drives across country, and ET's too
with full suspension, big meats, big brakes, huge fuel system, gauges,
big radiators, full aux cooler set up, kick out trap door pan,
160MPH ride height, certified roll bar, etcccc...
That is now a recipt for a big body super sexy 4700lb super car
a 4700lb super car
that puts down GXRs and Bussas from a roll
4700lb super car
makes koenigsegg owners go wtf @ 120
A 5.7 LT1 B-Body with excelent paint an interior costs $5-9K in Cali.
to outfit a koenigsegg killing B-body to be up to par / worthy of a 800RWHP mill will cost magnatudes more than the car and forged motor is worth.