i agree with JRP only in reverse, you should always make sure of ignition system and proper timing
before proceeding to fuel issues. if it is still a points ignition first thing that should be done is a
new set of points and condensor or better yet a swap over to electronic ignition which can be acheived
without spending an arm and a leg on the performance kit as chrysler went to an electronic system
starting in 1973.
go here for good swap over how to.
Replacing points with Mopar or Delco electronic ignition