I built my supercharged, EFI setup for my 5K for $1,500. Made 98-104rwkw(depending on which dyno I used) on 9psi. Still want a 4age?? :) Don't listen to me though, I'm now on a stupidly expensive journey to see how much power a 5K turbo'd will actually make. So it's safe to say I love "K's" with a passion!!
Seeing as your wanting an 86 in 70 clothing, it should have a 4AGE. It is your car at the end of the day and what you do with it is totally up to you. Nice car at that, good pick up. :)