Engine timing mechanical

Help me eliminate stuff
Its an ATI harmonic balancer with timing marks engraved , keyed so it cannot be off , correct ?
Timing chain cover tab could be off , right ?
I am going to bring #1 piston up to TDC , Timing tab on distributor should be at plug #1
0 on the ATI damper should line up with 0 on the timing chain cover tab at #1 top dead center , correct ?
Runs really good now by ear but I dont want hammer the engine to death or break a piston , ring if its to far advanced
I HAVE TO FIGURE THIS OUT< THX FOR HELPING