My Jeep is going into Burnsville to get a Hemi upgrade here in the next couple of days. My question is which engine to go with? 5.7 /6.1 /6.4 /6.7 /7.0 Any of them are a huge upgrade from the 3.8. If I go with the 6.7 or 7.0 I have to put off doing some other upgrades for a few months, like...