My CJ has a Dauntless 225 that is probably on it's last leg. Low compression on #4 Cylinder, loud crank knocking on cold start-up. I'm curious about the GM 231, is it a bolt in application? Are there better bolt in options that can be upgraded e.g., HEI ignition, TBI or other fuel injection options? Also it has a Dana 27A front end. I'm looking to upgrade to disc brakes. I've heard that if I get a Dana 30 from a 76 or newer CJ w/disc brake setup, all I need to do is change the drag link, and put in a proportioning valve. Any ideas? Suggestions?