Thank's again Ap.
I really like the sound of that Jeep in the video, barely noticeable at idle, which is grate

and won't drive you crazy during long trip's.
Then the next part Ignition... Is Stock GM Hei with Msd 6Al good enough ?
Also do I need to modify the bolt holes on the pre '87 intake to fit the '87+ heads ?
And the endless question, with the engine this mild and everything in good condition and properly tuned, would 15-17 MPG on the highway be in reach ?
Greetings from Iceland..