It’s probably a rear exit manifold, nevertheless pretty much any mid-’60s to mid-‘70s manifold from an A-body, G-body GP or even a 2nd-gen F-body will interchange. Those exhaust manifolds are very generic, the 455 uses the same manifolds as the smaller displacement engines so there’s nothing really special about them.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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