The PHS docs should break it down some more than that. I have a '67 GP 428HO hard top and I thought the PHS docs say how many 428HO GP autos there were - I'm not sure if it breaks down between hard top and convertible. I feel like there were 270 some odd GP's made with the 428HO/auto combo, but I will check when I get home. I would say your numbers might be off because the most likely full size to get the 428HO was probably the GP.
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