You could buy a Mopar 6.4 conversion/restomod harness and just run the engine as is-I believe it's about $1700. The Jeep 6.4 is a rear sump so you will need a mid sump pan if you want to keep the stock front suspension. If you are going with aftermarket front k member (that deletes torsion bars), you can use the jeep rear sump oil pan as long as the car doesn't sit super low.