Good point about the shifting.
They shift nothing like a shifter with rods.
The trans in the 59 whines a bit in 3rd, but all the rest of the gears are quiet
I have not yet got the 66 running yet.
Takes a while to get used to the shifting, but once you have it, they shift pretty nice.
I currently drive cars/pick-ups that have both types of shifters,
internal rail and external rods-----big time difference in shifting manners.