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Re: 427 tall deck in a 1979 K25 GMC
The core supports in the c70's etc. are almost identical and the radiators are the same width, BUT the big c series radiators are a few inches taller and possibly thicker. You could probably shoehorn one in but you may not gain enough to make it worth it.
Wish I could help you on the rest but I don't have any experience in those situations.
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