Basic timing is set by the computer itself - so no matter if you turn the distributor 5 degrees one way or the other, the computer will compensate for this change in timing. Look closely at the rotor - it's pretty wide on the end. All the computer cares about is that there be a certain degree range of contact between the end of the rotor and any one plug terminal in the cap.
I've just done an analysis of a 4.0L AMC engine by compensating an aftermarket camshaft gear to its original distributor. The distributor (non-adjustable timing) had to be mounted 25 degrees CW in order to function to this new camshaft (AT NO. 1 TDC). As for TIMING the 4.0L engine - the computer takes care of this, and NO AMOUNT OF FIDDLING WITH IT WILL ALTER ENGINE TIMING.
Just as long as that rotor is DEAD on the NUMBER 1 CYLINDER AT TDC, the computer will handle this timing ITSELF. It also controls advance and retard based on environmental and other physical conditions.
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