new member with 74 dodge dart starter problems

Hello everybody, my name is Marty and I have a 74' Dodge dart swinger with a slant 6 that I am trying to get going. I recently replaced the starter and while it turns over good, the car will not start at all. I should also tell you that the carb, i think carter 1 barrel has vacuum leaks. I say that because it is very hard to crank when cold and idles high-low when it does start; not all the time though, sometimes it idles good. Anyway, since I replaced the starter it will not even "hit" at all, like it is getting no gas.
Any suggestions?
Marty