There is nothing wrong with up grading the stock L82 but the numbers thing means you have a lot of rebuild work to put it back STOCK for the numbers freaks.
Sit the L82 aside and build what you want. The numbers will be OK sitting on the floor while you and the little lady have fun in the Vette.
Just my 2 cents........
"I won't be wronged . I won't be insulted, and I won't be laid a hand on. "