slick ??? for you guys

im just stuck on why buddies cars go so much better in the 60' then my car does and i have put on the better parts and they or on 40 yr old parts ....makes me think your just better off leaveing things alone and go racing....i spent on shocks, new perchs,set pinion angle, ok shocks on front ....i dont even think 1 of them have frame conn.