318 running beyond rich

Well fella's, I know I haven't been on here to much lately, work has kept me busy.

I have been having a problem with the dart, it has terrible throttle response, it runs insanely rich, I adjusted the floats and the air/fuel but it didnt help much at all. The Carb is a Holley 1850-3 that hasn't been rebuilt and is pretty old. Would a carb rebuild solve my problems?

Also, the car feels strange, I wouldn't say gutless because you can feel it has some power in the secondairies it's just not much, could my one legger stock 8.25 rear end and old beat tranny have something to do with that? would things like a full msd ignition help?

Just a few questions to get my car running better!

Shawn.