Hidiy Jay32- Welcome to Stovebolt! Try to drill down your situation a little for everyone:
Does the 1958 Apache 235 engine turn over? Will it run? Why does it need to be rebuilt?
What do you consider a "rebuild"- a complete engine teardown to the individual components & built back up, or just the (my broad definition:) external changes you mentioned?
The ignition, starter, generator, & alternator questions & answers would usually be in either here in the engine shop or electrical shop forum (depending on the question), and you can search to see what options there are. John hooked you up with some good info there already, and everybody will be glad to help once you lay out the situation alittle more specific.
Brad
