350 Olds headers?

[77 Mirage]

Does anyone know if there is a reason you cant run 455 Olds o/t headers on a 350 Olds? I know the flanges and ports are the same for the 350 and 455, however companies only list the headers for the 455 not 350. Marine exhaust manifolds are always listed for 350/455 as the same part. I dont see a reason you could not use them unless there is something I am overlooking. Thanks

[wasted$$]

olds 455 & 350 are the same on the exhaust. intake manifold on the 455 is wider.

[malcolm]

Yep, same thing.