Agreed.
Unless you have a purpose for running the mix-matched set, try not to. Running Radials in the front and Bias Plys in the rear is not as bad as doing the opposite- i.e. bias plys on the steer axle with radials pushing it, will seem like the front end is on ice. Radials conform to the uneven roadway so much better than a bias ply will. But if you're just hot doggin to the track and back, as long as you can handle a loose rear, you should be fine.