need to know what to set timing at on a 94 chevy s10 4.3L V6 W engine code

after putting it in base time, set dist. to zero.
base time is set by disconnecting the timming check connector. here's location of connector.
The correct location of the Set Timing Connector is inside the cab where the Heater Box and the carpet meet on the passenger side floor.

Pull carpet back to expose the single wire and connectors on the outside of the control module harness. The wire colors are tan with a black stripe.

best advise i can give you is hook up a vacuum gauge to your intake vacuum source around the base of Carb or Throttle body and move the disst till you get the best vacuuam reading and then lock it up.