I just converted my 69 from a non power drum to a power assisted disc in the front with all new brake lines from front to rear. Do I need to bench bleed the master cylinder before hand? If so, where can I find the instructions? Also, the master cylinder seems a little high and I might have trouble with hood clearance.........any suggestions? Is it possible to stick some alignment shims behind the top 2 nuts of the power booster to lower the cylinder? Will that have any ill effects? Thanks

Dan, I am wrapping up my 4 drum to 4 disc brake upgrade. I left mine manual so no issues with the M/C being too high. From what I've read here most folks recommend bench bleeding the M/C. I plan to do that on mine. I made my own bench bleeder. I used the two short lines that connect from the M/C to the distribution block along with some plastic tubing for the job. I simply attached the two short lines to the M/C pointing them up instead of down as they would be going to the distribution block and then ran some tubing from the end of them back to the M/C fluid chambers. You secure the M/C in something like a vice, fill it up with the brake fluid and manually pump it a few times using the push rod until you stop seeing the air bubbles. When all done you will need to mount it back in the car and very quickly without spilling too much brake fluid reconnect the lines back to the distribution block. I can take a pic of my setup when I get home...

I recently installed a wilwood m/c, and decided to mount the m/c first, then bleed it using some old brake lines that I bent. This way, the brake pedal can be used to push out the air, just have to pump the brake pedal a few times. Afterwards, connected the brake lines and bleed the rest of the air out. Mine was manual as well.