I put disc brakes off of a 67 chevelle on a 59 chevy once. The chevelle bearings fit the 59 spindle, but the seal diameter of the 59 spindle was to big. I put the 59 spindle in the crank grinder using centers and ground them down to match the chevelle. It worked great. I dont think you would gain much switching to the corvette drum brakes. I recently picked up a 63 corvette rear end without drums. I had a pair of drums off of a 55 chevy and they fit perfectly. I know we are talking about the front axle, but I have a feeling they will be the same too.