backfiring through carb

trying to get my Dart running. I had it running but it was missing heavily and no matter what I did it would not get any better. Now Ive messed with it so much that I cant get it to fire again. Ive been having issues with the multiple manuals Im using....none of them seem to have the same procedure for installing and timing the distributor. It is also backfiring through the carb.

question one
any suggestions for a good manual?

question two
what is the correct /6 firing order (my manuals differ with this too)

question three
any issues using a 75 motor/balancer and a 64 points dizzy?