iv got a cam but car at work(4/5 miles away)your on the right track mate
ill try to make it easy for you to understand the best i can...
the screw that you adjust the fuel mix on the plenium has striped the threds so i removed from housing (held on by two torx screws) to find the adjusting needle has broken off and wedeged the plenium open. i have removed broken part before it went through my turbo.. now iv no idea how to make the adjuster adjusable again without geting one from the scrapyard of an xr3i if its the same but been told it might not be.