Juggernaut and Rollerball is an odd double, but I kind of like it. I'm less sure about combining The Godfather with Goodfellas (although they are a great compliment and contrast, subject matter wise), purely because The Godfather feels like a cinematic six course dinner by itself. I think I should have mentioned as a caveat that for double bills, films ought not be much over two hours. That's just my opinion, of course. :)