I'm converting my 69 Camaro from power disc/drums to manual 4 wheel discs and I have the Serious Street setup from Baer. I have an aftermarket cut-to-length MC push rod that I am now installing. What is the correct method to measure the correct length? THANKS.

Measure the depth of the M/C from its mounting surface. Subtract 1/32-1/16 inch. This would be the length of the rod sticking out of the booster from the surface the M/C would mount against.