www.speedwaymotors.com has a line up of under floor master cylinders, all of them except 1 are dual masters, the single pot master is a reproduction Ford master used until '48 I think it is. you can get them in power also, with an under floor booster. I don't think your going to find a spindle swap kit for this early of a car, that MP brakes kit looks good, I wonder if those are factory GM calipers, if so that would be great. also if that kit does not include bearings, get a set of roller bearings for it, they last longer and they do have 1's that fit it.

Dave do you know how to ajust about 1/4 turn of play out of the steering on these cars? mine's got about that and I can't find the over/ center ajustment, but I never looked hard. during hard breaking, the car stops ok with the drums, they were compleatly rebuilt b4 I got the car.