Those noisy straight-cut transmission gears would drive me crazy, I think.
I wonder how this car would perform with a better gearbox. I presume it's a 3-speed + an OD box.
A modern 6-speed manual would not alter the character of the car too much, but if the gearing was suitable, would make it...
I'm always and will be recommending various big block parts for those who want to pep up their engines. This is just part of one shelf in my barn. See what all you can find Mopar engine parts wise.