I did the NP 435 swap with a gearbanger shifter. I wanted the granny gear for playing offroad. As others have said, knowing your intended usage will help to get recommendations that fit your needs.
The NP 435 is similar length to the stock 3 speed, so some of the swap is simpler. The same driveshafts work, unless you are adding enough lift to need longer d-shafts anyway. But the shifter comes thru up under the dash, so it needs to be bent back quite a bit, or replaced with a
gearbanger type shifter to work. It also requires a good sized hole in the trans tunnel, but vendors that sell the gearbanger also offer sheet metal to cover that. A taller body lift helps too. Mine has a 1 inch BL & required a pretty good hole. It is also a heavy feeling truck-like shift, so if your'e looking for good road manners, you might want something smoother.
If you do choose the NP 435, be aware that there are different versions & not all will work. Dodge & GM are a no go. Ford married requires an output shaft swap, while Ford divorced or 2wd is easier.
Novak's site has a lot of info regarding identifying the correct tranny.