You mentioned a disc brake conversion. Just fyi, I have a 64 vette with drum brakes (no disc brakes in 64) and a 67 with 4 wheel discs. The drum brake 64 car stops every bit as well as the 67 disc brake car. I understand (at least for vettes) their performance is very similar until the drum brakes get excessively hot (towing, steep mountains, roadracing). So you might wanna throw those dollars somewhere else, unless you have a need for (or just prefer the look of) disc brakes. A dual reservoir master is safer tho.