I have a 1967 camaro convertable with 10 bolt single leaf rear end . i have bought a 12 bolt multi leaf out of a 1971 nova .will this fit work and have same height of car

A 67-69 Camaro rear end will bolt on to the Nova, so it's not a stretch to say that the same would be said in reverse. Obviously, you will need to change your springs to multileaf. Ride height may change slightly. Probably for the better....