HELP!! with my 75 Dart

Well, the very first thing I would do is pull the needles out and blow out the passages with compressed air.
Junk settles in those passages and causes idle quality issue's.
A full pressure direct contact with the hole blast of 1/2 second or so in each.

Sorry, don't know anyone in that area except for Don Gould at 4secondsflat.com but he's in Oregon.
He is a really knowledgeable Mopar/racer and doesn't mind helping people.
I really appreciate that.. thank you..i Will try that.. I'm also gonna try and get my 300 back from that shop! 300!!? For what!? To tell me my carb needs to be rebuilt!? I'd like to know what they did? Not a damn thing!! It's because I'm a woman I'm assuming and they think i don't know any better.. I'm not by any means an expert..but i have been wrenching on cars since i was a kid and i know more than most girls.. My dart Sat in my mom's garage for over a year due to a badly leaking transmission line..which i replaced myself.. This guy at the shop wasn't even a twinkle in his daddys eye when this car was built!! Grrrr