Actually Bondurant did maintain the cars very well.
I have Bondurant SHO #5 (93 MTX). It is a 3.0 and has just over 13,000 miles. They are track miles, but I have not had any problems with the car (other than replacing all the tensioner bearings since they were dried out and crunchy). The car still pulls strong, and does not smoke. I don't think you would need to rebuild a Bondurant engine any more than any other used engine. 13,000 track miles might be like 60-100k on the street???
The Orange Bondurant SHOs were ATXs, so they would have 3.2s in them. There might be spare 3.2 Bondurant engines floating around.
As far as I know there were never 3.3 Bondurant engines unless someone bought a Bondurant engine and then disassembled it and built it into a 3.3
As stated earlier, the Bondurants did not have major engine tricks, just better suspension, cage, fuel cell, brakes, etc.
- Mike