beware the transdapt adapter. i used the same one on a jeep 258. couldnt get the thing to run right. sprayed some carb cleaner around the base and huge rpm fluctuation. i took a little mirror and looked and there was actually a gap between adapter and manifold. vintage speed sells a really nice adapter - well machined and no leaks i could tell..
be sure to check initial timing with the vacum hose to the distrib clamped and after the engine was warmed up.
sounds like could also be a mixture problem. set mixture with vacum gauge to manifold vacum, adjusting idle as needed. mixture - idle - mixture - idle until get highest vacum at correct idle speed.
be sure the carb settings are on the money - the rebuild kit should have how to adjust linkages, blade to body adjustments, etc.
just my 2 cents
