Paint exhaust manifolds?
I would replace the small hole 340 passenger's manifold with the much, much larger 360 magnum. This way the exhaust outlets would match. Of course you'd have to redo a short section of your passenger's down pipe?? The small hole 340 passenger's manifold only has a 1 7/8" outlet, the 360 magnum can be opened up to a little over 2 1/4", which is what the 340 driver outlet measures.
Otherwise, a good circular wire brush on a drill, high heat paint and proper heat treat as per can instructions will accomplish what you're looking for:
treblig
I would replace the small hole 340 passenger's manifold with the much, much larger 360 magnum. This way the exhaust outlets would match. Of course you'd have to redo a short section of your passenger's down pipe?? The small hole 340 passenger's manifold only has a 1 7/8" outlet, the 360 magnum can be opened up to a little over 2 1/4", which is what the 340 driver outlet measures.
Otherwise, a good circular wire brush on a drill, high heat paint and proper heat treat as per can instructions will accomplish what you're looking for:
treblig