I bought a 67 RS/SS it has a 350 with an Edelbroc Performer intake, 4 barrel carb. with a Powerglide trans.. It was rebuilt prior to me buying it. At normal city and highway speeds it seems to drive ok (except for drinking the gas). If I'm out on the highway and put the peddle to the floor. It will hit 90mph and then start to drop off until you let up off the gas. 90mph is as fast as I can get it to go.(Note) I'm not sure how accuate the speedometer is with the age and use of 15" wheels.