It's a lot more than that: It was the job that could have saved Bertone from bankruptcy. It was basically production-ready, FGA though canned it to favor the then soon-to-be-launched Brera-based Spider.
6.6 l 403 CI of American engineering the 5.0 305 was only tolerable in the third gen when it made 200hp and the 4.9 301 was a waste of potential. It made 220hp in turbo spec, who knows what would have happened if it was refined in the third gen (250-300 hp by 1992 if it lasted that long?)