75 318 Dart won't start and backfires!!!

I changed the ballast resistor today and now it will backfire a couple of times when I crank it and then it just cranks and no fire again, I'm going to try and turn the distributor 180 degrees this evening and see what happens. Could you guys tell me how to leave a thanks on here, today is my first day and you all have been more than helpful and I hope you all know how much I appreciate it. once again, THANKS A TON!!
don't overlook the ECU. make sure it is well grounded to the body and that your battery to block to body grounds are solid. the thank button is in the lower right hand corner of everyones post.
* check for spark out of the coil first* before you mess with the distributor