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Originally Posted by junkyardjohn
YOU CAN DO THAT TOO. PULL THE CAP & MARK THE DIRECTION THE ROTOR IS POINTING WITH A MAJIC MARKER, ON THE FIREWALL OR VALVE COVER . PUT IT BACK IN EXACKLY IN THE SAME DIRECTION. JUST REMEMBER THAT THE GEAR ON THE DIST. IS A HELIX GEAR & WILL TURN SLIGHTLY IN THE LAST INCH OR SO OF INSTALLATION.  JOHN |
Junkyardjohn beat me to it.
If you are swapping distributors you don't need to know nothing about where the engine is.
Just draw a circle on a piece of paper, take the distributor cap off, mark a pointer on your paper showing where the rotor is pointing, pull the old distributor, and drop in the new one pointing in the same direction.
If there is gonna be a few days inbetween tape your "map" to the firewall so you don't lose it (and you remember which way is "north").
The only time I've had to worry about where TDC is is when I've done a timing chain and/or cam and/or dropped a distributor in a new rebuild. In all of those cases I just make sure I leave it at TDC when I have the timing chain cover off then if I rotate it I just make sure I keep track of whether I'm on #6 at the timing mark or at #1.