Bear:
I have a 425 in one of my 770's and a 460 in the other. There are hardware changes from the lower hp motors to these, i.e the 350 and 375, but these might be just a reflash of the computer. Good luck in finding a Volvo dealer to change some parameters for you. I went to 2 dealers here in the twin cities (mn) and neither one wanted to do it. (If it ain't broke -----).
Dave (old phone man) has a guy in Oregon, who does great things with reflashing, not sure what part of the country you are in.
Sorry couldn't be more help.
Chuck
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