You might try checking out the wheels and tires section and post your wheel question there, more of our technical people look there than in the newbie section, here's a link: http://www.ramforumz.com/forumdisplay.php?f=129
. Performance wise, a good intake and exhaust are a couple good ones to start with, just depends on what you're looking to get out of it. I had a 318 in my old truck and did headers, cam and dual exhaust which suited my need for power pretty well lol.
And the "Z" is how we all affectionately refer to the forumZ