Idleing Issues!!!!

First off your timing should not be at zero. It should be somewhere around 10-12 before tdc. And remember to unplug the vacuum advance when checking the timing. It sounds like your timing was probably close to begin with and now you have it retarded WAYYYYY back so it's going to be a real dog. Get the timing set back to where it should be first. The accelerator pump has no affect on idle whatsoever. It only gives the engine a shot of fuel when accelerating. Thus the name accelerator pump. If it's not working it will cause the bog you mentioned though. Rebuild the carb and make sure and clean it real good with carb cleaner inside and set all the settings right to spec. per the paper work that comes with the rebuild kit and then adjust it like the other guys said and you should be good to go.

BTW: If it idles better with the choke half way on sounds like it's running lean. After the rebuild start with the idle screws out about 1 turn more than they are now.