I fit accuspark units to all the cars I restore as they are easy to fit, reliable and don't have any ugly boxes to screw inside the engine bay. Most of the units are under fifty pounds.

Hi Chris, the main advantage of having electronic ignition is better starting. It also means no more fiddly points to change or set. There are many systems available on the market. I don't know what vehicle you possess but a call to the relevant owners club would be helpful. I'm sure that they would recommend the best one for you. I suppose as in all things buy the best you can afford.
Jan