1968 340 timing

AJ/FormS said

Correct,
but neither is correct; there is no correct; as to how it slides in, and there is no wrong. Unless you want to be factory anal about it, and if your D is not a Mopar, It still might not be factory correct.
When the rotor and the tower and the plugwire to #1 plug ,are all three aligned, when the MSD sends the spark, then it is correct .
If it runs at all, then it is correct.
Whether the ignition timing is or is not correct, remains to be seen.

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Correct. The way I installed the distributor is the only way it will work tower 5 o clock. The vacuum connect to the distributor is so close to the fire wall....it can't be set at 6 o clock....it will hit the fire wall. I'm pretty sure it set it right years ago. This weekend I'll double check everything....TDC....use some timing tape. I'm also checking out all wires...as I did not install this system. The MSD is under the dash.

My son has been using the car. Now when I turn of the running engine at idle 800rmp the tac will stick at that rmp. So I shut the engine off at 1000 rpm and the same...the tac stays 1000rpm. Once the engine has stopped...I can turn the key on just to get power to clear the tac to zero out and the turn the key back all the way off position. As soon as the key is all the way back position. Suddenly I can feel the engine make a slight rotation movement. Like the engine never rested until the tac zero out....does this make any since.
Never had any problems before... until my 25 year son used the car.

Thanks all for your advice. Chris