Found that the plugs were gapped at 30 instead of 35, BUT:
A vacuum leak under the dash was causing the backfiring and flat spotting!
Anyway, it has been cleaned and detailed and all the wiring under the hood was replaced and it runs like a top. Can't tell there was a fire - sure wasn't fun getting all that smoke residue off, though.
Thank you all for your help and suggestions.
Jay D'Angelo 64 Iml Cvt Las Vegas
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