Aha. Well, looking up Mason Adams, I can tell he was a US-based dubber, so I assume this film was dubbed in the US rather than in Rome, then. Speaking of which, I wonder if maybe MAN OF THE EAST could have been dubbed in the US, too, because I don't recognize any voices in that film. It just doesn't 'sound' like the films that were dubbed in Rome usually does, if that makes any sense.
Haven't had much time to check out anything else, but I did look at (or should I say listen to?) BLACKIE THE PIRATE. Now, the IMDb lists the following voice cast for this film:
Terence Hill - Larry Ward
Bud Spencer - Richard McNamara
Silvia Monti - Carolyn De Fonseca
George Martin - Robert Sommer
Diana Lorys - Susan Spafford
Sal Borgese - Charles Borromel
Luciano Pigozzi - Edward Mannix
Carlo Reali - Geoffrey Copleston
I can confirm that McNamara, De Fonseca, Sommer, Spafford and Mannix are correct.
I don't know about Larry Ward, but he did appear in some American movies and several TV series, so it should be possible to find some live sound appearances with him in order to confirm whether this is correct or not.
I'm not terribly familiar with Charles Borromel, but after examining a few of his performances, I'm inclined to believe that he is indeed the voice of Sal Borgese.
The identification of Geoffrey Copleston as Carlo Reali's voice is completely wrong, and so are nearly all of the voice credits attributed to Copleston on the IMDb.
Finally, I can add that Edmund Purdom dubs his own voice.