I sincerely doubt the reserve on that car is less than $20k.

The 3.5 in the Prowler was the one from the Intrepid/Concorde, not the Sebring or the minivans. It was later resurrected with a few tweaks for the Sebring/Avenger and a bunch of other forgettable Chrysler products.

If you’re prepared to pay, you CAN have what you want. Buy the closest factory configuration model, arrange to buy the parts, and pay someone for the labor of swapping those bits out (or do it yourself).