Mild 318 misses at 3000rpm

Sorry, rotor phasing is the position of the trigger in the distributor in relation to the terminals in the cap. Due to the small block dist being so small in diameter there is not much room for error before the spark might jump to the next terminal or be very weak. Search MSD rotor phase for a very good video. Then take an old cap and drill hole near number one tower. Hook up timing light and see how far off the rotor is when it triggers.Vacuum advance alters the phasing.