Dave, I would have to agree on the 'twitchy' braking. I did a volare clip on my last 51 pickup with a brum rear end and a mustang 2 booster. You could sneeze and lock up all fours. It made it difficult to control braking at times with the high pedal since I modified the stock pedal assembly. How much pressure would you say you have to apply compared to a new vehicle with power brakes?