It is a JB-2 (from total source). The case says W.C. 0.08 lbs, but the specs I found for the JB-2 are -1.5. The old regulator says W.C. 0.2 lbs, which apparently corresponds to the red spring. Now for the good news. I pulled the line that goes to the PCV valve and plugged it, and it started and ran perfectly- smooth idle, no hesitation on acceleration, no stalls. It may be that plugging the line boosted the vacuum enough to make up for the wrong spring rate, or it may be a bad PCV valve. If the PCV is good I can still plug the line and run a "breather" on the PCV, but I'm wondering if the higher vacuum requirement of the regulator will change the mixture or fuel curve. I know this is handled at the mixer, but does the amount of fuel delivered by the regulator change by the amount of vacuum...or is it an on/off type of delivery?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.