Clutch Olds- the 442 manifolds will not work on 65-70 big Olds. The LH especially is a totally different animal. Your manifolds will work on 71-74 big Olds with 455, and can be used on 75-76 if you don't have catalytic converter (downpipe and transmission x-member is different between converter/non-converter).
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Glenn Williamson
Rocketraider
member AACA and all major Olds clubs
1964 Starfire, 1969 Toronado, 1974 Hurst/Olds, 1976 Ninety Eight
There's a Dodge K-Car and a Ford truck hiding in there too! Hey, ya gotta have something to beat around in...