I recently acquired an original 1967 Camaro heater system out of an estate. The owner originally bought this out of a junkyard to convert a 1968 Camaro that had AC to non-AC. The car was stolen before the conversion happened and this part has bee in the garage rafters ever since. Based on the heater core date of 67C, I believe these parts to be out of a 1967 Camaro SS396.
I have parted this heater unit out and listed each component on EBay starting at $9.99 with NO RESERVE.
Each component has a link below:
1967-1969 Camaro Big Block Chevy Heater Core Cover
http://www.ebay.com/itm/352617377036
1967-1968 Camaro & Firebird Non-AC Heater Controls w/ Cables
http://www.ebay.com/itm/372627401083
1967-1968 Camaro Interior Big Block Non-AC Heater Box Real Deal OEM GM 396
http://www.ebay.com/itm/372627409441
1967-1969 Camaro Big Block Heater Core Assembly Dated 67C Harrison Real OEM GM!!
http://www.ebay.com/itm/372627412774
1967-1969 Camaro Big Block Firewall Heater Rubber Block Off Covers Unused Holes
http://www.ebay.com/itm/372627429962