Hi Stan,
I went for the standard Ignitor system, and also ordered the high powered flame thrower coil at the same time, which is rated at 1.5ohms resistance. There is also the Ignitor 2, which is a bit more flash, and I think you can set the dwell angle, but if you read the description on their website, it's more suited to tuned/performance engines.
I went for the Aldon system as it was recommended by a few people that I had spoken to. I don't know much about the Lumenition magnetic pick up system, but the older optronic system with the control module that bolts to the inner wing, could give trouble.
The type of fitting for the Aldon system will depend on which distributor you have. There are 2 types, where the points either fit to a triangular shaped base plate, or a circular one. I found the guy's at Aldon very helpfull when I ordered mine.
The best way to check what kind of shape your mechanical advance is in is to firstly, check for excessive play in the shaft, and then if that's OK, you can check the advance curve with one of the more expensive timing lights, like the one made by Snap-On tools. The one I've used in the past has a dial on the back, with measurements in degrees. You turn the dial to however many degrees you want, and then align the top dead centre markings. For working out the advance curve you make sure that the static timing is correct, and then get an assistant to increase engine revs in say 500rpm intervals, and with each increase turn the dial until the top dead centre mark on the crank pulley lines up and then take the reading off the dial. It would probably pay to get someone who knows what they are doing to check this.