Just something to think about....fast forward 10 years....how much is each car worth at that time?
I've owned and sold a 1955 Chevy Bel Air, a 1956 Chevy 210 Wagon, and a 1956 Chevy Bel Air Wagon. For all three, I never lost a dime on them, including purchase price, upgrades, and maintenance, when I sold them. Old cars hold their value over time and are like a savings account you can actually enjoy while you have it.
With a 2010 Camaro, it's going to depreciate, a lot, for years until it starts to appreciate like your '68 is right now.
Garage the '68 and sell the Avalanche in the background instead.