To add to his price list. The turbo he was given from sponsor is roughly around 2,000 depending on what Distributor you buy it from +/- 100-200 bucks. Used, half that price. The clutch, taking a stab in the dark since I don't know Southbend pricing I would guess is a 400-600 dollar clutch. So add that to his prices. Still a modest price for the amount of hp he's pushing and what more he can get out of it.
Im not sure what you meant by the doubtful quality comment you made. So he has a few parts not sold by Kyle at IPP or Greg at Specialty Z. Just because those parts were not designed for the Z by a dedicated Z performance shop doesnt mean his cars going to blow up contrary to popular belief.