Well, theres 6 to chose from, so to speak. The 4 spd came in cast iron and aluminum, overdrive and not, long tail and short tail. Then theres 2 bearing retainer sizes.
You'll need to find the short tail iron one to be correct. I do not remember the bearing size retainer for your car. At least the correct one.
The trannys also came with an overdrive. The first gear is deep @ 3.09 *I think* first gear and a .67 *I think* overdrive ratio.
Aluminum versions are out there, but can be hard to find and expensive to purchase.
I'd go to a die hard MoPar man for my tranny. And speak of which,
click here;
http://www.passonperformance.com/
Passon also has his own overdrive set up which is stronger than the OE way. He's been doing these for years.