hello all. I just installed a new brake booter in a 67 firebird. [ it was non power ] and i need to no the right hole in the peddle to use and also i need to no how long the plunger rod is?the one from non power is too short. mike0861@aol.com

lower hole in pedal.
upper hole gets a brake light striker plate.

dont understand 2nd question.
pedal should be ~2.5" from carpet jute. brakes/ bulletin 68-I-47

plunger on master side of booster can be long or short, to match a deep or shallow master. If you have a short rod and a deep master, you can get a pushrod spacer, or change master/piston, or pushrod.
pics and info on master/pushrod relationship
edit: fixed link to pozziracing.com