The cab swap to later model chassis is done all the time, maybe not by the folks here, but very common. Grinders, cutting torches welders are your friend. Maybe swap your chassis for another more friendly one. Maybe this thread needs to move over to the HiPo Forum.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
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USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)