Thinking about a turbo slant...

I think you can manage a 170, boosted on a single T3 with a low pitch impeller.

Also, if you are feeling super cheap and you don't want to mess with a blow through carb that is designed for holding boost, make an air box that surrounds the entire carb and put a nice, sealed throttle cable on it. The carb will never know. If you want to mess with the carb, just be sure you seal the lid with a few good wing nuts and some good weatherstrip.

You can use that holley all day long with a carter fuel pump, run a signal line from the turbo feed line to the mechanical pump and you're golden. Just be sure you have a gauge, so you can monitor baseline fuel pressure.

Drill a hole in the side of the pan, pop an oil feed to the turbo, run an oil cooler up front, right off of the turbo return line...

If you ran that CT26 Toyota turbo, they aren't too expensive and that would land you about 8psi. 10-12 if you shimmed the wastegate bracket to pull the spring tighter, away from the housing with a few washers.

There is a guy that makes cheap, plasma cut steel flanges for those turbos, for making custom stuff. I think they're about $30?

If you are worried about boost loss, don't use a blowoff valve. Those aren't necessary for a low boost car. Use a diverter valve. It's the same idea, but instead of just taking the high pressure away from the back side of the impeller blades and dumping it into the atmosphere, it has a horn on it that you can use to plumb rubber/ metal line to the intake tube of the turbo, so it takes the pressure from one side and equalizes both sides of the impeller blades.

How this effects boost, while shifting, is a slow decrease in psi, rather than an immediate drop, but it still manages to take load off of the impeller blades and gives the pressure somewhere to go, when the engine will not use it, as the throttle plate is closed/ blocking the pressure, during clutch.

You don't need to power shift that clutch to death.

I think you can run what you have with a very simple design. Because the exhaust and intake are on the same side, and the turbo works by using unburnt fuel and exhaust pressure building heat and spinning the turbine, like an afterburner in a jet engine, I think it would be a good idea to run an intercooler. Even if it's just a little one, because I think the intake runners will get too hot on that engine, without one. It will help differentiate heat readings from the staggered exhaust and intake runners, being right next to each other. Especially on something that may sit in traffic.