Can anyone help me change from manual to power assist? I purchased a power booster and master cylinder, but it seems to long to fit.

My 68 Fairlane SW has power brakes. The booster & mastercylinder are pretty long. They are right next to the shock tower. One of the lines comes off of the bottom of the master cylinder. Does your M/C have one port on the bottom?

Yes. Mine has a port on the bottom, out at the end of the unit.
Also, I am wondering if you could do me a big favor?
Can you measure the length of the master/power booster unit?
Can you tell me if there a plate/adapter between the unit and the firewall which causes the unit to adjust so it ends up just inside the shock tower?
Thats my hunch right now. I'll have to find a plate/adapter if you see one in there.
Thanks much.
Sam

Sam,
My unit is 18" from the firewall to the end of the mastercylinder. It has a bracket at the firewall end that spaces it up and out from the firewall. The bracket also has a bellcrank setup to match the amount that the assembly is raised from the hole in the firewall. It lines the rod on the pedal to the pushrod going into the booster.
Andy