I have the 7/8" Wilwood MC in my 66 Coronet with 4 wheels discs. I really like the pedal feel with the 7/8" piston and no booster.

You will need the 4-2 adaptor and adjustible pushrod Wild Bill mentioned.

I'm running the Wilwood 4 piston calipers in front and suspect the 6 piston calipers will be fine. The Wilwood booster has lots of volume available, but I would check with Wilwood or Dean at www.hotrodsusa.com to be sure.

Make sure you've removed the booster type pedal linkage if you go with manual discs. My Coronet had power drums so the linkage had to be removed. The pedal ratio is now close to 6 to 1 with the booster linkage removed.