Is your engine supposed to be level?
 

Just did a gasket replacement on my 2.7 and noticed that the rear inside seemed more charred/baked than the side by the front of the truck. It seems it's tilted back and it just seemed odd. Normal?

First time seeing inside my motor and there's no gunk build up (or very little) after 180k miles. I bought it when it had 85,000 and have no idea how it was treated before. I tracked the VIN and found it was a rental car in Florida for the first 5 years of its life.