converting points to hei on a chevy 283

first off im working on the sister in laws car and its a chevy 283 from 1967...we need a forum for non mopar stuff...i know there alot of mechanics among the crowd here so here we go. i dropped a new hei dizzy into the 283 and wired the hot wire to the coil...im trying to find out if i need to run a new ign wire or use the original one on it. it keeps back firing left and right i thought i might be 180 out so i turned it and its doing the same thing... still not starting...its getting close to starting then it will backfire.. maybe i should start off by telling you what i have replaced...new eddy performer intake. new eddy 600, used hei dizzy new spark plugs gaped to .40 new 8mm wires with correct boots... ive run the wires in order and it is just backfiring left and right. am i missing something here