advance springs

If you really want to mess around with it, get the FBO limiter plate kit with the sprAngs from Don Gould. A lot of times in the past, I've had good luck with one light sprAng and one medium SprAng. Two lights are too light and can sometimes have some mechanical advance at idle. Two mediums are sometimes too heavy and don't allow total timing until 3K or more and that's a little late.....unless you have some compression.