Your intake is junk, I'm sorry to say. It is an EGR style manifold. While it wouldn't hurt performance much, it is heavier, the valley pan would need changed to accomodate the massive EGR bulge beneath the intake. Scrap it and find a 68-72 manifold, they are everyware for around 75.00. At least in the States...
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Paul
FAST Automotive -The Pontiac restoration shop, not the fuel injection guys! I had the name first.
My site... needs updated-
www.fastrestorations.com
68 GTO's (RA II, RA I, HO, convert, Pro Street, Racecar, etc.), 2 69 GTO Judges, 70 GTO racecar -10.77 @ 124mph, 68 Tempest survivor, 3 03 Aztecs!
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