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With California smog you're supposed to put all the stock parts back on, duh :P
At 18:1, you're losing around 20% of laminar flame velocity which sounds like a lot but it's not that many crank degrees. One idea is to look at the timing at a lower load value: if 50% load is -30 deg and 40% load is -35, I think -35 would be approximately in the ballpark. A lean mixture has higher thermal mass, but also a higher reaction rate due to more O2, and the two factors should cancel each other out in theory.
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