CB360t Front and Rear tires/suspension

So, I just joined the site. So first of all "Howdy". I have a '76 cb360t and am looking to replace the front forks with more modern ones...I can do this, but it seems i might have to sacrifice my spokes if I do that, which would suck. I wouldn't mind going with new allow wheels, but how in the world am i going to find a matching one for the back that will fit on my bike?

The biggest problem I feel I'm going to run into is getting the chain aligned if i throw a slightly fatter tire on the back.

If anyone can give me some insight on this stuff it would be cool. Thanks.