Just finished replacing the aftermarket HEI that was on my 69 302DZ when I bought it with a 1111481 distributor. Did not check timing before removing old ignition system but car ran fine. Started right up upon restarting with original style ignition, problem is when trying to move distributor to set within spec timing, engine dies. Runs fine at about 30 degrees advance but can not set to spec timing mark. Have checked for TDC and mark is correct with scale. Vacumn advance plugged. Any suggestion?