Tighter emmisions standards

Back to the OP, retarding timing will allow the use of lower octane fuel. Back in the day, we had 95 octane regular and 100+ octane premium. Along comes 87 octane no lead and rides start sounding like marimba bands when floored. I owned a 66 Dart GT 4-bbl with CAP. IIRC timing was retarded about 4ยบ.
CichliDart said
CVCC
My current smog problem here in Kalifornia is my 99 Dakota R/T. It barely failed the smog test. I wanted a new cat for it but they do not make them anymore! They stopped making them a few years ago and they were like $1200! So now my $25,000. truck sits in the driveway with no way to register it with out throwing myself on the mercy of the California air resources board smog referee station. :banghead:
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Try Rock Auto. They show a couple that are CARB compliant, $130 + the ride.