1992 Chevy Van ignition wirering and timing

Engine Mechanical problem
1992 Chevy Van V8 Two Wheel Drive Automatic

i had to take the oil pump out to replace the shaft guild. I need to set the timing as well as the firing order. Can I bring the #1 cylinder to top dead center and point the roter of the distributer? Or is there a easer solution. This is a 5.7 350. Thanks