Panel Fan,
I just rebuilt my 235. It runs super. At 50 miles per hour seems to be it's sweet spot. I guess I'm just not use to hearing the engine practically screaming down the road at 50. Just not used to the sound.
If it's fine to drive it at 50-55 miles an hour and it won't blow up the engine. Then nuts to to changing the rear end gears.

Thank you for your information and also talking some sense to me on this topic.

Elmo