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Hi, are you trying to set the ignition timing?
Ok, is the head back on the car already? Are the rocker arms installed?
Rocker arms off?
I'm just concerned that you might have bent the valves when you set the head on. Are the valves of #1 cylinder closed? Was the #1 piston up when you set the head on?
I'm assuming that the crank pulley is still on the crankshaft. The marks are all the way in against the block on the innermost crank balancer. There are two sets of marks on the balancer. You use the ones that are closest to the motor. The pointer is on the right side upper at about the 1 o'clock position as you are facing the motor.
You have to be careful that you don't run the valves into the pistons and bend the valves. When installing the head you should set the cam on the timing mark with the lobes of #1 cylinder pointing up. The #1 piston should be at TDC when installing the head. You can back the crank up about 20° just to be sure nothing hits when you set the head on then rotate the crank to TDC and install your chain.
Someone may have installed the balancer incorrectly. Can you easily remove the head and visually put the piston at TDC?
Do you see the two sets of marks on the crank pulley?
Ok, when you put #1 piston at TDC you will need to make your own reference mark on the crank pulley.
Check the outer marks and see if they line up but most of the early SL's used the inner marks.