Quick question about BFG Radial T/A's

I found a set a cokertire.com for under $300, so I'll most likely get them from them.

The main reason I wanted to know if they'd fit is because I took my car to Lesschwab(spelling??) and they told me 205 70r14 wouldn't fit on my car, and that I'd have to get a whole new wheel size. Since we're talking about wheels now, I wouldn't mind getting a set of Mopar Rally Wheels where's the best place to look for those? and do they come in the 14" size?

What I want to do is this, get the bigger meatier tires in the back(BF's) and get the rally wheels back there too. But since I'm going to have to take the wheel off should I replace the brakes in the rear end since I'm already back there? I've got NO clue when they were changed last, and I've got Drum Brakes in the rear, disc in the front.