My dad's business partner had a Corvair fetish. He had several, most served as a spare parts source. I used to drive his Greenbriar around on errands and while it was slow it was a lot of fun. I'd occasionally drive his Corsa convertible and nearly flipped it once. The engine kept trying to be at the front of the car when I clearly needed it to be at the rear. I think that there was a super charged version of the Monza, I don't know how much it improved performance but I bet it increased the flip factor considerably.