Fair enough. That's kind of what I'm looking at now. A knock module for the MS3 is only $90, which is probably cheap insurance in the long run. I've already got the stock sensors as well, assuming they actually still work. The one thing that is getting me is the transition from high speed low rpm cruise to high rpm power. I'm right at the very edge of my rich power section on the table. My AFR is basically 14.7 everywhere to the left of 2500 rpm and below 70% load or so, going to up 15 in the even lighter load sections. Then the top right corner is 12.7 from 70-100% load and 2500 to 6500 rpm. My high speed cruise in 6th puts me right at the bottom left corner of that, so if I bump the cruise timing way up I'm not sure how the engine would like a 5+ degree drop in just a few hundred rpm. That being said, I guess as I got some more timing in it I actually dropped my load some. It used to take 80-85% load to do 70 in 6th and now it's down to 70-75% with the few degrees I've already added. It's just a very iterative process. A dyno would make it so much easier, but I'll see what I can do with just logs and seat time for now. Thanks for all the advice so far!
And I think I agree about the Modman issue with carbs. To me it seemed like the plenum volume just didn't do fuel mixtures any favors. I don't think you got much runner velocity on a quick throttle hit. Multiport injection certainly helps the atomization problem and then the runner is just about straight up flow and not fuel mixing. I was actually pretty surprised the difference between batch fire and sequential as well. My idle was never consistent before (though I think a little of that was I didn't play with idle timing on the MSD much) and I'm guessing the cam didn't help with possible reversion. Having fuel at each cylinder as that cylinder needs seems like it would help keep that under control.
