14" Steel Wheels

I was wondering if anyone knows where to get new or used 14 " steel wheels. I am new to the forum, and am working on a 63 Signet 200 Convert. I have the factory 13's on now. I just replaced the rear springs and I would like to fill the wheel wells a little more. I want to use the same dog dish Valient hubcaps. Also, do you know how wide I can go? 14x6 or 14x7?