I’ve had one in my car for about 5 years, blows hot, no leaks. Does need attention regarding fitment, I imagine any core you install would need help in that regard.
I used adhesive backed foam tape to seal up the sides of the core to the box. The better the seal, the better the heater will work. I would also recommend removing all the old foam from the mix door and put some foam tape on that as well. If you can get the door to seal well, that will keep your car cooler when you have the HVAC set to cool.
I believe I bought my core from NAPA.
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67 LeMans, 326, M20, 3.31 12 Bolt
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