This is a duplicate of my recent postin the "Treadlevac???" topic:
ABS Power Brakes in Orange, CA has an underfloor dual MC that can be used in conjunction with a remote mount electric booster. The dual MC is only 3-1/2 in high, so it will fit under the floor of a 51-56 Packard. The booster can be mounted anywhere, even under the dash.
See page 10 in the online catalog:
http://www.abspowerbrake.com/maincatalog_frameset.html The problem is that the electric booster is pricey (>$1100), but not as pricey as major injury or death. You could also go hydroboost and use the power steering pump.
Craig
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