“You could still buy the Hawk models, including the Silver Hawk and the top of the line Golden Hawk which shared the supercharged engine.”
The Silver and Golden Hawks were not contemporaneous with the Avanti.
Silver and Golden Hawks were last produced for the 1961 model year.
In 1962, Studebaker unveiled the beautiful Gran Turismo Hawk, which was actually a very artfully restyled “old” Hawk. The Avanti went on sale for the 1963 model year.
But, if your point was that any of Studebaker’s engines could be obtained in any model, then you are correct.
A GT Hawk or a Lark could be optioned with any of the various Avanti engines.