Hey AJ, if you want to keep running the lower octane you will need to retard the timing. Go back 2 degrees at a time till it quits. If its running good where its at just start using at least 92 or 93 octane. As far as the smoking after idle for awhile sounds like the valve stems seals are gone. At idle you have have high vacuum and it pulls the oil in through the valve guides. With that many miles it may be time for a valve job.
Bill
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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