In re-reading the thread, I notice never once do you mention setting timing. The symptom you describe makes me think of the vacuum (load) portion of the curve is what is getting you out of the doldrums and back into power, but it is not kicking in soon enough. Those 83 and 84 LH cars we had would accelerate well even with the load signal missing (vac line plugged), running advance purely based on rpm. Have you been troubleshooting with a vacuum gauge and timing light?
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Art Benstein near Baltimore
If you lend someone $20 and never see that person again, it was probably worth it.
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