If you have a factory big block Camaro........duh....put a big block back in it!
Real Factory big block Camaros have the two heater hoses coming thru the firewall almost under the hood hinge, small blocks over the valve cover. In fact , to put a big block in a small block 69 Camaro, you almost have to bend the hose outlets to clear the BBC valve covers.
"I won't be wronged . I won't be insulted, and I won't be laid a hand on. "