Well, if your Camaro weighed 4000#, it was carrying ballast too. A '69 Camaro V-8 coupe weighed 3135#, and a V-8 convertible weighed 3385# (add 249# for a BB).
The camaro has a lot of heavy options. convertible,BB,a/c,fold down rear seat,delux int,console gauges,p/steering,p/disc brakes,RS,TH400,posi,am/fm,8-track stereo,p/top,f/r bumper guards,tilt wheel.