That is good info yall, and a good future tip. Also thanks for the info from RLeo via PM. Also, the throttle situation on a '77 model is quite different from most of our other W123's. Gonna have to deal with that too. Will prolly start a thread to photo document swap and deal with any questions.
Started up Camaro today and got it out of garage, just to find out that I have little to no brakes. They are manual brakes to start with, so any degredation in performance is huge. Not sure where the leak is yet, but no puddles...... Think it master cyl at firewall. Uffffff.........