HELP!! with my 75 Dart

Sorry to hear of the issues. BTW, you don't necessarily need a certified mechanic... I know a few who can't tune a carb to save their lives. You need a 'competent' mechanic for older engines.

Is it running rough at idle, or when accelerating, or all the time? Can you describe this a bit more?

In what way did you look at the distributor? The term 'looks fine' is a bit vague. Would you want a couple of tests that you could easily do yourself?