[Mike Carr]

I'm sure the more aerodynamic cars are quicker/faster. How much so? That is a question for someone smarter than I.

You can win, certainly, with an older car. Dan Fletcher has won forty-plus of his eighty-nine wins in a S/S '69 Camaro, with small and big block motors as well as a Modified type car (SS/AS, SS?BM etc). He also has many wins in a big block (A-F, depending on motor) Stocker '69 Camaro. His son just won in it today at Seattle. Kevin Helms won three straight Stock world Championships (as well as several Indy titles) in a big block 4 speed A/S '69 Camaro. So, yes, you CAN win with an older car. And, yes, most certainly a newer, more aero-friendly car will be quicker (hence why you see so many Cobalts, Cavaliers, and other jellybean cars in SS/GT and S/S Mod classes).