I have a 1990 Chevy 3500 3+3 with the 7.4L bbc. I’ve been going back and fourth for sometime on whether I keep the 454 or throw in a 12v Cummins. The increase in power with the 12v not including a a few bolt ons and the better fuel economy is appealing. My truck isn’t lifted yet be considering a 4-6inch lift as well. It’s just an all around work truck, tow from time to time, a little bit of mudding and off-roading, hunting etc.. what are your thoughts? Keep the 454 or swap for the Cummins?