69 Camaro Engine Question

[Zaxx81]

the heater box on the firewall, the heater core tubes next to the fenderwell (center of heater box) its BB heater core tubes to the center of the car (edge of heater box) SB

Is it easy to replace the heater box to fake? I don't think the previous owner was trying to fake a COPO because the car has Z-28 emblems on it. But it was originally an automatic so it can't be a Z-28 (plus it's X-11). The heater box has tubes in the middle.

[64impala]

run the vin