looking for a certain 440 exhaust manifold

33IMP said
Those are likely 383 manifolds and might not fit a 440 properly (taller deck, wider engine). The proper 440 A-body manifolds run about $3000-5000 a set, if you can find them.

I'd look REALLY hard for the one you had!
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My M-code GTS had 383 manifolds on it when I bought it, they fit but are pretty close to the steering column.