I'll try and make this as brief as possible. Last time out motor had a miss especially midrange and had a hard time building rpm's. Sparkplugs were in bad shape didn't replace this spring as they looked good on inspection at the time. While replacing them some yahoo broke this http://www.bbcboards.net/zerothread?id=708926 . So I finally get a replacement and get the time today to get someone to verify timing as I was under the impression this was some kind of timing adjuster. The guy verifies timing but never touches this piece? Take it out afterwards and the miss is gone but motor is sluggish to 4k rpms and slowly builds to 5k where it stops and would not pull anymore. Hitting the primer makes it fall on it's face. When he checked it is was only off a degree or so he set it to 18* while cranking. We didn't re check it while running at 5k rpms that I have read is the correct procedure.

So two things what does that adjuster that I replaced actually do and opinions on what my next steps should be. Thanks