What a topic.
Much can be discussed on the need of timing, here are some basics. I like to use manifold vacuum hooked up.
8-10 degrees idle with no vac line hooked up
20-25 with vacuum line at idle
36 full load no vacuum
40-50 with no load on highway with vac
Best to use a adjustable timing light. These cost around 75.00. Your engine will thank You.
