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Old 11-04-2021, 02:01 PM
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unruhjonny unruhjonny is offline
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Join Date: May 2004
Location: Calgary, AB, Canada
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I cannot attest to which headers work, but in the late 1990's a friend bought a stupid mint 1978 Grand Prix (it his cousin's neighbors, and I'd often drool at it in years prior).
It was a pretty loaded 301-4bbl car, and when the head gasket needed replacing (if my memory serves me) he opted to build a 1971-400 for it;
I believe that he needed nothing fancy to make it work - I believe the same mounts were used.
I cannot recall if he went with headers, but my gut says he used F-body exhaust manifolds.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)