Bill, I had the heater box out to replace the heater core on your post sedan, so you shouldn't have any need to pull it anytime soon.
I didn't see any numbers on the box.
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Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan
Don't text and drive.
Somebody's life may depend on it!
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