HELP!! with my 75 Dart

not much help today but I can come up next Saturday and help take a look, your not quite 2 hours north of me, or if you can or have someone to help you here's a couple of things I would check first

points
all plug wires still on
all vacuum hoses still on
all electrical connections still in place and snug,

one thing about old cars is they start acting up all the time without warning, without knowing very much about your car other than it ran fine before being hit leaves a lot of possible issues it could be, the hit could of just helped something along that was bound to happen anyway.