I know when maddart made his kit he clearanced the frame a bit for the piping, or he also used the headman truck headers for his set up he did, I ended up going a different path turbo set up. But he just spaced the engine up 1/4".
I tried hard to look into that option but I didn’t see how it was going to work on the drivers side with the steering box. Not sure the exact placement on the newer body’s but I figured the collector would hit or be right at the box.