my 67 had manual drum breaks that were changed to disk using what looks like a new manual drum master cylinder by the previous owner,I want to know if this will work ok as I am putting all this on my 68 or does it need a manual disk master on it,he ran this car in a 7.0 index 1/8 mile class and I guess it stopped ok since its still in 1 piece.Also want to know what the difference is in the 2 masters,Thanks