OK, here is the latest on the poor idle:

As per Atlanta 60 I checked the amount of fuel pumped per compression stroke. I connected a long fuel line to the OUT that was marked at 10". The fuel line was suspended vertically above the engine so the pump was pushing against gravity. After a several tests, the fuel moves about 1" per stroke (10 strokes for 10" of fuel line). This is quite a bit more than the 1/4".

I got the O rings and replaced them in the carb. The carb was clean with no residue in any of the passageways. The O rings appeared to be in good condition, but I replaced them anyway along with a new needle valve assembly.

I put in a brand new OS #8 plug.

Basically everything has been repalced (except the pump).

Sad to say, it still will not idle or run under 5,000 rpms.

I have a couple of FX's so I may try to adapt one of those carbs and try it on muffler pressure. I'm not sure the big carb will work very well on muffler pressure alone. Not sure what to do with the pump connections if I try muffler pressure. I don't have a spare non-pump backplate.

Does anyone know what the adjustments on the pump do and what is the proper procedure for adjustment? I haven't changed anything, but since the paint seals are gone, someone else may have changed them.