Are you saying you had to adjust the jetting in your flat-tops for the later heads? This is important to me now, because I am getting ready to get back out on the road this year - with a new (to me) '81 engine, but I am still using my '79 carbs.
For the record, I am keeping stock exhaust - and intake.
Does your new handle have anything to do with the red-line LED on the early R65 tachometers?
![Wink ;)](./images/smilies/icon_e_wink.gif)