8.1 will make a great economy engine but no performer.. cam is way too big for a N/A engine of 8.1 tho.. personally. I would twin turbocharge it, and crank the boost.. if it's set up for supercharging, at 8.1:1 you could run 15 PSI easy, which is good for upwards of 500 hp. 2 Matching Holset HX-35 turbos from Dodge Cummings diesels would be about right...