[69k20elky]

I'd like to do a powerstroke, I know that 12 valves are pretty much the best for making big power and getting the best mpg, I'd just like something a little different and my goal isn't really to get crazy power and I only get about 3 mpg with is as is so either will get me a pretty decent increase, my main concern really is how much work will need to be done to the firewall to make a powerstroke fit without a body lift