1993 GMC C1500 replacing distrubtor and timing

I removed the intake manifold to fix heater line fitting leak without marking distributor placement.
I set #1 piston up on compression stroke, I set on what crank on waht to be appears TDC and installed distributor pointing to #1 tower. First I could not get to fire, finally it runs barely, tired turning distributor no better. Someone said I need to unhook a wire some where to computer to set timing. Timing light is brke but should be able to get to run good enough to get to garage to set timing. I might be a tooth off but I cant turn oil pump with crew driver or afraid to try, it whould not have change anyway? What to do