How do you vacuum time a balance Chevy 350 engine with out a homonic balancer?

All engines must have a harmonic balancer instaled on them. Balanced or not.

Hook a vacuum gauge to direct vacuum port on intake. That is a place that will have vacuum on it when the engine is running at an idle. Then read gauge and move the distributor until you get the highest vacuum reading. It should be 18 to 21 inches of vacuum at an idle.