I hope you have luck finding a faster rear. Not many were produced and lots of people have been looking for them for years. If you are contented driving 50 or 55 you are not going to gain much with faster gears. Those old engines reached their advertised horse power around 3300 and it doesn't hurt to run them at that speed all day long. I drove them at rpm over 60 yeas ago and it doesn't hurt them today.
