I RECENTLY PICKED UP A 1964 FORD GALAXIE,352,AUTO. WHEN I GOT THIS IT WAS RUNNING AROUND 1500 RPM.CHEKED THE TIMING AND RESET IT TO 10B. RAN PRETTY GOOD BUT HAD A WEAK SPARK.PULLED OFF THE CAP AND FOUND PETRONIX IGN AND FOUND SCORCH MARKS BETWEEN THE CYLINDER TABS ON THE CAP.I SET THE CRANK ON TDC ON COMPRESSION STROKE AND ROTOR WAS BETWEEN CYLINDERS. PULLED DIST AND GOT IT Alligned to #1. STARTED ENGINE WITH VACUEM ADVANCE DISCONNECTED.HARD STARTING ,WHEN IT DID TIMING WAS ABOUT 30 DEGREES AFTER TDC. RECHECKED EVERYTHING AGAIN ,SAME OUTCOME. DID THE TIMING CHAIN STREACH? BALANCER SLIP? ANY IDEAS APPRECIATED!