That is a nice wheel, well worth the effort.
You need to measure first, the fork tube on CB750 is 35mm diameter (there was 33, but that's so rare we can skip that one). If your fork is 35mm, you are home free and all you need to find is a CB750 triple tree.
If the tubes are different, you will new parts machined for it.
As far as the rear wheel, again, you need to measure how much space you have. If the regular swing arm does not fit your wheel, look for a late CB swingarm - for instance 77 CB750F. They had rear disc brake and the swing arm is 10mm wider than the older K style.
Good luck - my current project is to mix and match 73K and 78F2 - that's why I know a bit about those swingarms.