1998 Chevy Express 1998 Chevy express 5.0 engine swap now n

I just swapped motors on my van5.0 vortec for a 5.0 vortec same year, after getting engine in brand new distrbuter, plugs wires, cap, rotor, I now get a no pulse width the motor wants to fire it will kick once and by looking at the scan tool, reads no pulse width, all other ranges seem good throwing out no codes any help would be greatly appriecieted, also forgot to mention this motor has a lt1 cam the other motor was stock, kept orignal harness and all sensors and pcm