MOPAR hasn't built a true slant 6 in many years.. Yes they were long lasting engines for their time.
The 4.0 is a far superior STRAIGHT 6. It is fuel injected with a computer running everything. You can't go wrong with a 100K 4.0.
If you are going to keep it on the street I'd leave the height and tire size all stock. It will perform better on the street in stock form. You will have better power, milage and handling as it comes from the factory.
Just clamp on your gumballs and go for it.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />