should have the breakdown by hour, whats their hourly rate? has to be well over 100 bucks if it cost that much, and no way it would take 120 hours? really 3 weeks of labor???????????? something doesn't add up if they can't prove it don't pay it.turbo kit maybe a 4 day install at most at 8 hours is 32 hours at 100 bucks 3200.......
I just said the same exact thing sorry i didn't read your post but your 100% correct i tore about my 302 in fox body, assembled, short block, put trans in, re did interior carpet, seats re upholstered... and it was maybe 48 hours worth of work.....
not saying doing a turbo isn't a lot of working and welding etc... but i literally stripped a car and rebuilt it in less then 120 hours. thats insane but as long as the quality is there in the long run you did right.