If I were you, I'd build it up as inexpensively as possible, as norskagent and others have suggested with the wheels. Get it built up and see how you like the ride. Then, slowly start finding the 'period correct' components. If you try to rush finding the right components NOW, you're gonna end up paying through the nose. No one will stop you on the street and take your ride away because it's not period correct, unless you happen to run into a few of the curmudgeons from this forum.