Which route should I go

The boost only comes on when you're under load. If you're not in gear it will spin the turbo but no boost.

I agree with heavier springs to keep the advance down some. The big question is what's the number on the carb? Lorenzo, didn't you go to a non ECM carb? If that's the case you may need to check vac at idle and change the primary spring for a lighter one. If the power valve has too strong a spring it won't open enough or maybe you need a needle/jet change for a little more fuel. Did you overhaul the carb? If you did, did you see what the primary needles/seats were marked or the secondary needles? Tuning a Q-jet isn't hard you just need to do some reading.

The carb shop in Ontario californication can help you. Look in a car mag to find an add for them. You need to get a book on Rochestor carbs, I've got 3 of them myself and they're well worn now. Haynes is the most common but if you find one by Doug Roe it's the best one. Do a search on evilbay or amazon and see what you find. The power valve is internal and you have to take it apart to get to it. You can take the top off while the carb is still mounted so it's not a really bad job. The spring is under the power valve so it gives you a chance to check the main jets, main rods, secondary rods, and the secondary hanger to see what you have in the car. The secondary needles are interchangable as are the hangers. The primary aren't though so you need to get a book to identify which carb you have. It'll either be a 4M or an M4. The M4 is the earlier one and the 4M is the newest one.

Lorenzo, Please te-type that. I couldn't understand the last part. Whadumean burn off?

Sounds pretty good but I think you may have an exhaust leak or something's knocking. After it gets rolling I bet it will haul.

BTW there's a 7.5" rear out of an early (83) t type for $200 in the for sale section. Take a hose small enough to fit in your ear and move it around to see if you can hear the noise. If you don't find it that way get a stethescope and see if you can find it.

If it's a 7.5 it would fit but by the time you do the set up it might be cheaper to get the rear. With the 3 speed tranny you really don't want to go over a 3.08 if you want to drive it on the highway. If you want a set of 3.42 I have a complete center you can get cheap enough. They're still in the rear and the center bearings are new (I put them in and the customer stiffed me). You'd just need to change the pinion bearing and set it up. It's not a posi though. It's out of a 4th gen camaro and the axle is sitting on my porch right now. I kept it for the disc set up and haven't torn it down yet.