Well, sounds like you've got it dialed in for what makes it happy at least. Maybe the 20R never had the head mounted fuel pump? <img src="/forums/images/graemlins/confused.gif" alt="" /> I worked on a 21R-U a couple years ago; had the Type I on it. Hmmph.

Snickered about your muffler (Red-Green deer alert!). If you go over a 2-1/4" you lose a bit of the low band; you need some back pressure.
Sounds like with your ol' gal that it's time to do a compression and leakdown check to see how things look.

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