This is on a Chev 350 bored .030 over. Running 9.5:1 compression, Performer intake, plugs are gapped at factory specs (I can't remember if that is .035 or .040).
I'm thinking the problem is with the adjustment screws - but could be wrong (obviously).
I'm getting some yellowing on my air cleaner - and can smell fuel regularly when idling at a stop. Still get's decent mileage on the highway (18-23mpg - gotta love those tall gears :-).
- Ryan