It has to be from a car that came with a catalytic convertor on if from the factory, they switched from 2 bolt flanges to 3 bolt flanges in 1975. There are only rear exit manifolds after 75.
Basically any 75-79 350-400-455 manifold will work, 301s are different having an extra bolt into the head between the center exhaust ports.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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