They turn in the best 60ft time set at 3/4" wet, will really jump off the line. Probably better gas mileage and slightly less percolation at 7/8" wet.
See my shootout results at
These floats were all 3/4" to 7/8".
If they are anywhere in that range I leave em alone.
I have two c4af-r carbs, they have 49f and 58f jets. Not sure what the factory jetting was, I bet the 59f in back might help things a little bit.