Geof,
There's really not much to learn. The only basic difference in the operation principles between multi-port and sequential is the fact that the multiport fires all eight injectors at the same instant, for the same commanded time duration.
The sequential system is just that, it fires each of the eight injectors sequentially at the time at which the intake valve is beginning to open for that cylinder. The batch mode doesn't sound very efficient but it has proven out pretty well.
If you notice in an L98 engine, over time there will be quite a lot of crud in the plenum. With this fuel hanging around over the course of two engine revolutions, I think that's why you see this. I have never opened one up, but I expect that the plenum area in a sequential injection system is much cleaner. At least, in theory, it seems that it should be.
I have a very good manual on Bosch fuel injection for my other brand cars that describes these principles. I'm sure that it can be found in most any fuel injection publication that covers the Vette.
Have a great day,