350 turbo question

[loneranger]

I just put a head gasket on my 90 350 SDL at 197k. The bores are still round, head flat, valves good, compression on cly's high end of good range all within 5 psi of each other. The car has always seemed to lack power on accel. Cruises fine and mpg is within specs. I checked the boost pressure and the must I could get was 9 psi. Book says should run to 14. I pulled the turbo, bought a rebuilt kit for $110 (seals and bearings). The waste gate looks fine. I still only get 9 psi but did solve seal leak problem. The disk is spinning at idle and spools up, waste gate is closed. What is the problem? All I can think of is inlet or exhaust system blockage but all is stock and inlet is not blocked. Really don't want to pull exhaust. If boost was running to 14 psi I would probably find my missing power. Ideas?