[niles]

I did a search on phasing and got nothing.
Distributor phasing is the relative position of the reluctor pickup/tigger signal to the postion of the rotor relative to the dist. cap rotor post when the fire pulse comes from the msd box. In the old days sometimes the coil pulse comes when the rotor is midway beween posts and you might get fire to two posts. Phasing is a 60's prob and I would'nt expect on a MDS dist. The symtoms would be lying down at hight revs or a misfire. If your car is clean at high revs, don't worry.
The fix used to be renotching the distr. cap to rotate it more closely to the right post when the coil pulse fired.
gn