1st thing is to qualify 0 top dead center like 31 Vicky said, then if you don't have an adjustable timing light buy the right size timing tape for the diameter of your balancer installed with 0 top dead center qualified with a piston stop. Have a helper give it a short hit of 4000 rpm, and set at 36 it should be totally mechanically advanced by then. (All IN) Over the years you never know what was changed in the distributor, springs, weights, advance limit bushings ect. so you want to check if it still has about 20 to 22 degrees movement. With your helper take a reading at 3000,2000,and idle to document its curve and total movement.