Re: electronic spark controle moldule
The electronic spark control module takes the place of the vacuum advance canister and centrifugal advance weights on the old style distributor. The engine control module (ECM) measures intake vacuum through the MAP sensor along with throttle position and rpm's to electronically adjust the spark advance. It can be checked much like the old style with a dial type timing light or timing tape on the balancer.
69 RS 355 Tremec 5-Speed 4.11's