I had a factory small block 75 Monza when I was a kid. Only a two barrel carb, but was lots of fun when you found an empty parking lot, locked the steering left or right then-you could do unlimited tire spinning.
Fun car. I never put any modifications on it, and as I recall the drivers side spark plug was impossible to change without partially removing the engine. The Small block in this car was a real GM shoe-horn job. Very Tight.