Take off the vacuum advance line and plug it. Set initial timing to 8-12 degrees advanced at idle 600-800 r.p.m.'s . This is a good place to start . Total timing should be in at 25-2800 r.p.m.'s this should be around 28-32 degrees advanced . Every engine is different . these numbers should get you in the ballpark though.Use a quality light , one with an advance knob and get some timing tape for your size balancer.