I did some reading on the 200r4 trans. Having rebuilt at dealer level a bunch. They are a good trans and smaller than the 2wd Mopar OD so fit ment is better in an Abody. Sadly Mopar newer engine swaps are a PITA unlike Chev or Ford swaps. I wish Ma MoPar was as kind to the aftermarket kingdom as the above mentioned brands are. Just the fact aftermarket parts like door handles or mirrors for a 50 year old car have to be licensed in order to sell let’s you see the strangle hold they have on the market. I read both of the posts mentioned above (3.9 od and the 3.6 pentstar) both ALOT of work and cost. IMHO- time is not cheap. A 3.9 and OD trans is easiest and best bang for the buck for transportation. Parts readily available and it still looks very different at car shows to catch people’s eyes. That is is you still want a “something different”