4.3 Vortec distributor

1994 S10 Blazer Tahoe 4x4 4.3L Vortec CPI (W).Distributor was removed
(No Reference Marks For Reinstalling The Distributor) and the engine has been turned over a number of
times,what is the correct procedure for reinstalling the distributor?

Find Top Dead Center of #1 cylinder

Pam3, Did you ever get it back in. Im doing the same thing to my truck in the next few days. Where did U find the distributor? Did you get it from a Junk yard?