Horsepower with mileage options

Lots of good info but just read Daves' mileage build on Moparts.
Everything he did is provided with the result obtained.
It is not as simple as "adding this or using that". I haven't read through it in a long time and it is a long read but if i remember correctly the best cam was a 60's 273 piece!
I gave it a read, definitely long but like you said great amount of info there. I got my son to see that going with a 4bbl is a more viable option, for both milege and wanted performance. Currently and sadly he is only getting around 14mpg, which our one ton diesel gets better (If my son leaves the tuner stock).