318 MAX fuel economy builds?

Nice looking ride @Dmopower. Your mileage and power build isn't everyone's cup of tea, but it is right up my alley.

I took a different approach back in 1994 I put a 518 in my 340 challenger. It would knock down 20mpg on the highway provided I kept my foot out of it.

There are some good threads on moparts you would be interested in. Look for super duper 318 and super duper 5.9 threads by @hotroddave. Not sure if he is on Abodies or not.
Thank you and thanks for the information.