like mentioned a 1968 ford f 100 with a 360 v8. i had to put in the distruutor exactly like book said finding top dead center and what not ive checked the firing order a hundred times. heres the issue it cranks acts like it wants to fire but wont im getting fuel to the carb and spark to the plug but just wont fire and acts like it wants to but just cranks and canks and cranks and occasional backfires do i need to set timing how would i on this engine anything besides timing? thanks