Guys, do some home work and you will find that the Novas, Venturas, Omagas 1977 came with Chevies, Buicks and Olds motors, and they MIXED them up! You had no idea what you were getting!
I had a devout Pontiac nut friend who was more than happy to tell me his sister had bought a Ventura. That was until I opened the hood and found a Buick motor!
This was part of the "lost years" with GM, the beginning of the end if you will.