Sounds very interesting so hope it works out. The booster looks to be a bit smaller so maybe a 6" diameter?? Just FYI, 52-55 power brake pedals look almost the same with essentially the same size and style pad but they did make some changes in the arm and bracket attachment areas. Relation to accelerator pedal is very nearly the same in all years though.
For 56 the pedal changed considerably with a completely different support. The single high bracket became a pair positioned a bit lower on either side of the vent opening and arm became slightly shorter but much wider plus moved to the left side of the steering column. The pad is also wider but the ralatonship to accelerator stayed about the same. If the new system keeps the pedal in that same area it could probably look near stock and be much less of a learning to like it curve than some of the other mods.
One feature of the Treadlevac that will surely be lost with the modern unit is the light and almost minimal pedal feel and travel. There is a
53 commercial where at about the 35 second mark it shows the car being braked to a smooth stop by rotating the tip of a foot from the accelerator over to the brake and just barely touching the pedal. That light touch feature was mentioned by Packard in a lot of their advertising..
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