I agree with Gotta_gofast on his points. A c4 can be plenty stout, I used the 157 tooth flywheel in my 98, the front of the tunnel needed no trimming, but I had to modify the back of it. My truck is back halved and substantially lowered however. When I did mine, no one made motor mounts or headers for 98+, I had to make my own, which sounded worse than it actually was. A cage with bars through the firewall to the frame and bars out the rear window to the frame, I get no twist, the truck runs straight and hard. I'm prejudice towards strokers and blowers. (383 with a 6-71 dynoed at 683 hp, 653 tq). Put a block gridle on if using a stock block, better yet, get an aftermarket one. Backhalved Rangers are very rare, you'll see s10's but no Rangers. In MN I have yet to see another tubbed Ranger.