Just so you know, the 4.0 is not a power house and besides stroking it (I chuckle a bit), there isn't much you can do to fix that, short of replacing it. The jk minivan motor can be supercharged.
I believe that copper tj on hardline has a couple of issues: STAKS t case; no complete top. I could be wrong, but make sure it well meet your complete needs.
Good luck.