Need Experienced Turbo Users Help

[79TransAm]

I'll start off by saying i know very little about turbos, so pls dumb down your language as much as possible, or just define if possible.

I'm planning a build for the 79... im looking for like 650ft/lb tq and 600hp. I'm planning on stroking a 455. This is the kit im looking at. 474"]http://gallery.bcentral.com/GID4716958P1571498-Rotating-Assemblies/Balanced-Rotating-Assembly-Converts-455-to-474.aspx)]474 Stroker Kit[/URL] Gonna get 114cc heads from like a 75ish 455(hopefully will have them on it when i buy the engine.) I'm trying to find out from pontiaction what the approx. cr will be with their pistons and these heads. Plan on doing cams and what not... Now I want to throw a turbo on it as well. I might end up just turboing a 400ci instead so if anyone could give me opinions on each that would be great. Here is what a turbo calculator said would be good for the 474ci engine:
Garrett T42
Engine Capacity 474ci(7800cc)
Maximum RPM 6000 rpm
Boost Level 6psi
HP Rating 800
Non Intercooled
Turbine Hsg A/R 1.22
Airflow Lb/min 65.29
Base HP 709

It probably wont be around 700hp im aiming for like 650ish hp/tq. I'm buying a keisler automotive 5 spd that will handle 650ft/lb tq. My questions are bout how much will this turbo raise my cr at only 6psi. would you reccomend a FMIC? I read that with this low boost i can run like a stock eclipse BOV, but id have to do something bout the wastegate. Do you think this is a suitable size turbo for this engine or will it create massive lag, should i got with something a little smaller. I can probably find a turbo off a ford 7.3L diesel and make it work(in order to lower cost). any info anyone could help me out with would be great. The engine probably wont be built for atleast 1 - 1-1/2 years since im doing the suspension and interior first, but i just wanna have everything figured out, thanx in advance.

im looking at a couple turbos on this site, what does anyone think of these?



Turbo Options

Looking mainly at the Master Power T62 Turbo T3 .96 A/R Turbine Housing for $700 which doesnt seem like a bad price, would you reccomend T3 or T4 flange, and whats the difference?