I would suggest upgrading to a nice 4 barrel carb.
you can get them pretty cheap now and you can find them even cheaper used.
you can either get a 2to4 adapter plate for your intake or you could upgrade your intake while you are at it.
a nice used carb and intake could probably be picked up here on fabo from $200-$300 easy enough.
anyhow....being the case your looking to strictly make your carb work for you.....then I would say you need to find a few essential missing parts and you should pull it back apart and properly set the afjustments on everything.
good luck!