I am looking at a 1967Fastback GTA S-code that I am very close to purchasing. It needs to be restored and the car was what I was looking for EXCEPT that it has a C-6 auto transmission, I know I can convert it to a 4 speed but I have been told that is costly and do not know how to do it myself so I will have to get a shop to do it for me. Here is my dilemma: Should I leave it as factory since I am a purist regarding originality or should I go ahead and convert it to a 4 speed. Is the change worth it regarding value of the car. There is also the FUN factor driving it so please give me your opinions on this matter. Thanks to all who reply.