I have recently purchased a big block Camaro and the heater core tubes come out the center of the heater box. The firewall has the small block holes cutout for the other heater core location. The holes are sealed by a foam pad from the interior side of the firewall. Is this correct or was this car originally a small block car. Thanks

All Non-A/C Camaro firewalls have the two notches in the firewall opening behind the passenger side head that stick out from under the heater duct. Big block, small block or 6 cylinder are all the same. Big blocks just don't use them.

Sounds like a stock/factory BB heater set up to me.