Maybe a carb adjustment.

Could be something simple like the throttle cable clamp is loose letting the cable slide and thus not swinging the throttle lever the full travel

I've yet to see a carb on a 231..... that being said look for simple stuff first, like Greg said look for adjustments....or anything that couldve been put back and maybe was put back like it was originally. If the engine was overheated look for exh sys leakage, this could cause leaks and this would let exh gas escape and not make it to the compressor. Look for white powder like staining around the exhast sys between cylinders and turbine.

check prop govenor and control cable throw.

Something is not making sense. Even at 36" manifold pressure, you should be getting max RPM. I assume that is 2700 RPM for your engine model. You said it is a "TB", but I'll assume it's an LB.

So I would check the prop governor.

Also, what's the max manifold pressure for your engine? Do you have the Merlyn wastegate?

  Parker's comment may be on to the root cause. Many propellers especially the Hartzel use oil pressure to move the blades to the high speed position which work against counderweights that use centrifugal force to move the blades to the low speed position. If the engine oil pressure is not sufficient to allow the governor to provide full RPM. There is also the governor itself but there is also the turbo bearings and the expansion turbine of the turbocharger.

  To adjudicate the turbo a test run can be made with the waste gate valve lockwired in the full open (bypass) position. If the performance increases the turbocharger must be replaced. 36" is actually quite significant power and actually represents at least 6" of boost at sea level so I really do not suspect your turbo, you are producing a lot of power.

  The RPM is critical and at 2500 RPM you will not be able to transfer that power to the air for a proper full power takeoff. Swollen prop piston packing, prop governor or engine oil pump.

Any updates?

It depends very much on the engine model...personally I never heard about TSIO-360-TB...can you check once again if it is not a mistake!