I have seen several timing threads that mention a vacuum module. Mine is a non-vacuum HEI. From what I have been able to Google that means there is a ESC (electronic spark control). Given that how do I set the timing if needed? I believe there is a connection from the ESC that needs unplugged but I am not sure. Can anyone tell me if that is correct and if so what does it look like. My mechanic closed during the Covid last year so I am now on my own.If this is covered somewhere I apologize for not finding it.