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Slant top-chop. Lay the windshield back and make the back window 1/2 as high.
Plus all the other non-mechanical stuff— bellypan, wheel spats, Moon disks and airflow management inside the engine compartment.
All that will approximately equal what you can get from the engine swap, and if it's not enough there's still boat-tails and single-wheel trailers.
[nice hubcaps on that diesel wagon]
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