Carburetor options?

[Steve Beecher]

I have a 68/C10 PU w/350 and a Rochester Quadrajet 4 barrel carb..The primary throttle shaft is worn and i believe this is causing the truck to idle rough and basically run like sh!t, when it warms up it's better but no always. The power brakes don't work very well ether and i suspect maybe low manifold vacuum may have something to do with this carb?..I've given it the "carb spray" around the base of the carb while running and the idle smooths out but when i removed the carb i couldn't find any major probelms with the thick paper base gasket, maybe it's sucking enough air thru the worn throttle shaft..Also i've heard some Quadrajets require a metal plate under the carb between the thick paper gasket and the manifold?..

Should i get this Quadrajet rebuilt and the throttle shaft re-bushed or replace it with a Holley, or??

Any recommendations appreciated..........Thanks!