Need help with this problem.
Changed spark plug, gap was preset at 35 and merc requires 40 gap would this make a difference on reading the spark plug color?

Ran motor set at 22 degree 62 jets w/ 3 gallons gas spark plug almost all white with 1 side light tan, would this mean too lean or did not run enough gas to get color on plug? rpm 7000 mph 58.3

Changed jets to 64 made a couple of passes motor ran good until 6500 rpms then stalled a little then came up to 7000 rpms, could this mean too rich speed was 55.5 mph . Spark plug turning a little tanner.