Well, HVAC for me is putting the windows down. I was a young, dumb kid when I yanked all that stuff because racecar geez!!!!
Honestly, I went overkill and could've saved alot of money on the swap by using stock truck parts. However, my Cutlass is more of a show car/cruiser and I just couldn't use the ugly intake or front drive setup. If I were to guess I'd say I'm $6K deep at least on the swap, but I learned along time ago to not fret over build cost. I save, buy parts, save, buy more parts that way it's all paid for in the end.
You're definitely ahead of the curve on the stuff you already have. Get the car and hammer down!
That's a number that doesn't bother me, I would like a better looking intake than stock, but I could live with the stock truck intake.
I am thinking round numbers, the RJC exhaust is like $600, BW turbo about 950, $300 for the Hooker turbo manifold, maybe, 400 for a good drive shaft to work with the 80E combo, $300 for injectors, $250 alright intercooler, 150 for a fuel pump. Then either buying a tuning device or paying a tuner to get it running right. I'm sure I'm forgetting things.
Will need a custom down pipe and plumbing, but I have friends that can help with that. That's just under $3,000 without an engine and transmission.