Hold on it's being rebuilt now? I thought you just had it on the dyno less than a week ago? None of your claims match up. You make comments like "It's far from stock" Prove me wrong, go ahead. I think you will be sadly dissapointed. Youre niot talking to your average jeep enthusiasts. I've been around stoked motors, turbo motors, supercharged motors and nitous motors since I was about 11 years old I'm now 30. Even with a twin turbo set up I still say you won't get more than about 290 at the rear wheels and thats perfectly tuned.
So what kind of trans due you have? Axles? etc. Stock trans being an auto or stick will blow apart at 290 rear wheel. I guess they'll be "far from stock" too. You say youre going to use an atlas. Ok Atlases with tehir extreme ratios are meant for crawling but to reach the numbers you are talking your looking at a 7000-9000 rpm power band depending ons etup, which is not for crawling.