/6 build

I am currently building a 71 duster with a 198 slant 6 and 3 on the tree. I am using the slant 6 as a learning project before i put the new engine in during the winter and just want to see what it can do and if it blows up oh well. What I have in mind so far is building a custom intake manifold running EFI from an 84 buick 3.8l. Installing a comp cams cam kit with the following specs:
P/N: K64-241-4

Cam Style Mechanical flat tappet
Basic Operating RPM Range 1,200-5,000
Intake Duration at 050 inch Lift 220
Exhaust Duration at 050 inch Lift 220
Duration at 050 inch Lift 220 int./220 exh.
Advertised Intake Duration 264
Advertised Exhaust Duration 264
Advertised Duration 264 int./264 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.440 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.440 in.
Valve Lift with Factory Rocker Arm Ratio 0.440 int./0.440 exh.
Lobe Separation (degrees) 110

I ordered an MSD 6AL-2 programmable and am going to be running an AEM data logger on the car to learn how different changes affect the car.
I am building a set of step-tubed race headers and am debating on tossing in a garrett GT3076 turbo with an air-air intercooler.

The next thing is should i put a 4 spd transmission in the car?

Does anyone think this is a good build? Any comments or suggestions would be greatly appreciated. Thanks. Also what kind of power would you expect from a build like this? I was thinking of running 8lbs of boost for a little while and then cranking it up slowly until she goes. I'm sure someone on here would be interested in how much boost a stock slant 6 can handle.