The brake system is one of the places that you just CANNOT take any chances! I would say , "Sure," it can be done, but is it worth the trouble? The fluid tanks are different sizes and have different valving. In my opinion, you'd have to add front discs and replumb a good bit of your brake system to make it useful. I don't believe the original master will work with just the booster and I was thinking about the combo. The '51 master is under the floor so you need to be careful, there, that the booster will fit. There is a lot more than one would think to swapping pedals from bottom pivot to top pivot, however, if you can get everything and a piece of firewall from the '93 it is worth considering. Skill level, availability, time, and cost should ALL be considered before jumping into something like this! Keep us posted!
best wishes,
Les
