Cj2- Go Devil engine mechanic

[vicman]

Hello, I have an old jeep cj2. i believe that is the model, with the go devil engine in it and I would like to have a mechanic go over the engine and "Tune" it for me. I drive it on the freeway and after about 15 min it started to lose power so i shut it down for fear of damaging the engine, Thought it may have gotten hot. No evidence of over heat but would like to have it looked at. Any  knowledgeable and trustworthy mechanic recommendations/ Thank you. Victor Scott

I also might add, the mentioned jeep is for sale for 2500$