I used 68-72 A body headers in my 83 Grand Prix with a 400. These same headers were used in a 69 Lemans and a 74 Grand Prix. Even though tey were made for the A Body, they fit the 83 G Body the best. Also modified them to fit in my 62 Grand Prix until I bought headers from Mad Dog Headers.
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Eric
1969 GTO - 461, turbo 400, Continental 13", 3.08 gears. - 12.59 e.t. @ 108.43 mph, 1.898 60'
1978 Oldsmobile Cutlass Supreme- 461, turbo 350, PTC 3500 converter, 9" 3:50 gears. = 11.39 e.t. @ 117.55 mph, 1.599 60' on E85
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