Re: 69 Heater core replace, 6th bolt
Once the hardware is removed from the engine side, break loose the housing. You odn't need to even disconnect the cables as the housing will lay on the pass floor. The reason I suggested putiing down plastic to catch the coolant.
Unless you need to recondition the box, it's fairly easy.
Another important item to check is the replacement core. Most cores, I have read, are of a different size than original, even ones from the restoration houses. It may be a better fix to recore the OE core than to replace it entirely. If you do decide to replace the core, take your old one for comparision. Usually, ones having AC/Delco insignia are of the correct physical size.
Good luck. Check operation of the cables and the doors they control and foix those while the box is out. You can use clay weatherstripping from the hardware store to reseal the box to the firewall.
Take pictures of the process. It helps on reassembly.
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