Hey Mac,
If you just want to get it running , Rotate the engine around until mark on the balancer is at zero on the timing tab.
Take off the Distributor cap , Note where the Rotor is , Install Number 1 plug wire in the Cap to the left of the mark.(If you have enough slack in your wires)
Start your spark plug firing order (Clockwise) from this position , remember the Engine does not care where Number 1 is in the Distributor cap , It can be in any of the eight holes , as long as the rotor is pointing to it.
Start engine and Listen to the glorious smells and sounds of a Virgin Small Block come to life.
You can re-phase the distributor to put number 1 in the front after the engine break-in if you like.
Trust me , this WILL work.....
Your friend DESERT
