You would never have to adjust the dwell angle again. Actually, "dwell angle" is a meaningless concept once you take the points out of the distributor.
Timing would remain where you set it, until the distributor itself started wearing. Unless it slipped and rotated a bit by itself. It is still a good idea to check the timing every once in a while, but chances are VERY good that you'll always find it dead-on where you set it.
, nobody makes a substitute for the stock FI trigger points. You're stuck with them. Happily, they don't wear that much--they don't carry hardly any current at all--and the fuel injection timing is nowhere near as critical as the ignition timing. In fact, two of the cylinders always get fuel 1/2 crankshaft revolution before the intake valve opens. That indicates to me that the exact timing of the fuel injection pulse is not that critical.