I have the RamAir 2.5 manifolds with these down pipes in the attachment, which allows 3 inch exhaust all the way to the tail pipes.
https://www.ramairrestoration.com/po...y-headers.html
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74 Formula
469, 6X-4's, 72 Intake, Ramair Manifolds.
3 inch exhaust with x-pipe
Custom Roller Cam, 1.52 Roller Rockers
Quadrajet done by Cliff
3:42 gears
12.075 @ 112.70
12.092 @ 112.43
12.128 @ 111.71
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