I don't understand why, as a restorer anyway, that "we" would want a 1978 dated engine.
As a drag race engine, I guess it's worth it. JMO
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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!