The argument over what
oil to use during break in is here again. MSD tells you to not use
synthetic. REDLINE says to not use their
oil during break in as well, but use a mineral based (regular)
oil instead. More important than which oil, is that the gear is sitting at the right height, and the oil pump shaft is not bottoming out and under preload. Many people have had problems with their MSD distributor gear "going away" even with a non-roller cam. For that reason, some people are changing them out before they ever install the distributor. If it bothers you, than drain the redline out into a clean container and save for the next oil change. Check and recheck the fitment of the distributor before firing up the motor. Liberally cover the gear with the red lube supplied with the MSD distrbutor. I never run vacuum advance on cobra motors, they don't need it. Just give the dist 10-15 initial and have the centrifugal come in by 2500 to a total timing of 28-34 degrees, depending on what's in your motor and how the car is geared.