47-55.1 Finding TDC

[TX3100Guy]

My 53 pickup has a 1969 261 cubic inch engine. I currently have the spark plugs out, the valve cover off, and I've removed the Vertex magneto to get it serviced. While I noted the position of the rotor on the cap prior to removing the magneto, I suspect in servicing it the company will have rotated and spun the magneto out of that position.

While I know I can simply advance the gear so that the rotor is in the same position, I've read that it would be better if I got the engine to TDC (cylinder #1) and then when I reinserted the magneto, I could ensure that it was set at the #1 firing position. However, I'm not certain I know how to ensure that I've rotated the engine manually to TDC. Any guidance or tips would be appreciated.