Roll bar in 67 Barracuda?

I was wondering how hard it would be to install a roll bar in a 1967 Barracuda, with a stock interior. The interior is currently gutted. I don't think the car will go into the 11's, but I would be more comfortable with a roll bar if I don't have to cut up the stock interior too much. Anybody have just a roll bar (would that be a 4 point?) in their Barracuda?