What to look for when buying an engine.

Not to be a smart *** but $700 for a great set of headers that fit is not a bad deal. How much did you throw at the 2018 motor and you will spend twice the money of the headers for a harness and ecu.

If I wanted long tube headers then $700 isn't a bad deal. As the car will be more of a daily driver than a race car I don't see the need for long tube headers. I have a set of ceramic coated hedman headers on my truck and they looked terrible after a few months so stainless would be a plus, though TTI hopefully have a better coating than hedman.
Might still go for TTI as I know they fit well, just wanted to look at options. Have looked at getting the jeep manifolds that could fit, but it seems like they are more of a "might fit"