Hi I'm new here I'm JD ..... Help !!!!

[1993cobra5.0]

Ok here's the low down . 1967 Chevy camaro Chevy 350 with a t5. And a voodoo cam . Run good . I installed a MSD box and gaped my plugs at 45 now I'm back firing . So dumb . I played with the dizzy . Pulled it out :pat: Yes I know . Now I can't get it to run . Back firing , out the carb . Now I Lilly need to rebuild the Holley .
I was reading a posting that you guys was helping a guy like me . So I joined . Help

[1993cobra5.0]

Target master motor . Holley double pumper carb . MSD dizzy . MSD box . Long tube headers cam size 454 . Well about that size . I can get the size to the t . 1990 iroc z t 5 and fly wheel . The target master motor came in the iroc z parts car . Bought to get my 67 running and driving . It was running good just too slow . I don't think the timing was ever right . Air gap intake .