Keep the Chevelle. Camaros are over-rated.
I've got a '69 Chevelle, and my dad has a '68 Camaro - the camaro SUCKS any time you need to haul more than 1 passenger or any ammount of cargo in the trunk. They're neat cars, but not practical at all. You'll miss the space if you trade, especially if you have kids. Chevelles are just the right size, not boats like the 60s Impalas, and not too small like the Camaros & Novas.
The aftermarket isn't
quite as good for chevelles as Camaros, but nearly anything you can imagine
is available for a chevelle.