Gary,
1st thing to do is have someone step on the gas pedal all the way and look down the carb,engine not running, make sure the carb butterflies are opening all the way, if not adust the linkage,seen this a few times. ****** There is a choke interlock that prevents the vacuum secondaries from opening,find it at the base plate throttle linkage ,manually open the secondaries ,if they don't open then the choke rod needs to be ajusted.****
next......
Beg, borrow or steal a double pumper carb, bolt it on your engine and go directly to 5,500 RPM. This is the easyist way to find out if it's the vacuum secondaries screwing up, seen it happen on many cars.
Perry.
