all the exchange book shows in 67 is the 428 H/O and non H/O they don't list the 400 till 68. that being said the 67 428 is a #463 for the none H/O. it looks like 65 - 68 68 400 64 -68 tempest v8 67 326 will fit the 67 engine.
the same for firebird. 68 400 is the same
The muffler shop was able to fix the problem and replaced the exhaust pipe and muffler. I'll keep my eye open for a manifold, but this should fix the problem.
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