Itza 46, timing mark is on flywheel, Kind of like porshe or audie, anyway just above starter motor is a round hole with a pointer in it , disconnect vacuum at distributor, point lite at flywheel, look for steel ball inbedded in flywheel, line up steel ball with pointer your all set, hookup vacuum , also distributor hold down is not for adjusting timing, there's another screw usually toward block you loosen, hope this helps
jbennett
40 burb
