Edelbrock accelerater pump

If you very slowly open the throttle, will it rev up at all? If not, it is almost like the main wells are totally gummed/plugged up. This would restrict idle fuel for any off-idle operation. Since this is off CL, and used, seems like it would be subject ot any amount of crud in the carb.

When you said you checked the float drop, did you also check the float height from the cover with it inverted as per the manual?