Have you tried cleaning it with brake cleaner?
I do have a couple spark arrestors from old Mercruiser 454's that had Rochester 4bbl carbs.
If you are in a bad spot as far as sourcing a replacement, feel free to send some dimensions and I'll see if it matches up.
Unless someone (Dave R?) knows if the 5.7 and 7.4 spark arrestors are cross-compatible...?
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