Yep, you can upgrade the suspension and tires etc and their times will improve some. Keep in mind though that 400 hp in '69 is not the same 400 hp in 2002. On the bright side though, they are a hell of a starting place if you want to do some mods and have a killer looking car that's really fast and has lots of crowd appeal. BTW, here's my last daily driver from about 3 1/2 years ago. All original and stock and ran a blistering 11.5 at Sunshine whereas my current '91 Mustang runs 11.1 (best) at Bradenton. Not really a fair comparison since the '91 is slightly modded but still...