I have 2 cars with standard gearboxes and 1 with the Mitchell. I can't say there is much difference between them noisewise. All I hear with either is the musical whine you would expect with spur gears.
Aside from the synchro, the most enjoyable feature is having a second gear set that is 26 % higher.
A 3.54 R & P should work good with the Mitchell transmission. The higher second gear will help out the big step between second and high.
I installed a 3.54 R & P in my Vicky when I rebuilt the rear end. I still have a bone stock engine and transmission. The engine struggles a bit with the big step between second and high but after I upgrade the engine and install a Mitchell transmission (hopefully sometime this next year) things should be much better.
My opinion,
Chris W.
One of my concerns was if the high first gear and the 3.54 would be too hard on take off.