Valve seals replaced, and valve adjustments completed. Not an easy job as those springs will resist compression. Especially when covered in motor oil. Plus the keepers just don't come out easily. However the old 200, which had minimal deposits on head is running much better than before. However, the idle is much faster now. Already have a Pertronix II with Flame-Thrower wires installed. Plan is to add hotter coil, replace the plugs, distributor cap, and advance the stock timing. It has been suggested to put in hotter plugs. I have Auto Lite BF-82 in place. What can I go to for a hotter plug? Also, is that a good idea?