manifold guage on 5.7 volvo

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(I think) The 570sp is a pre-vortec GM block. Mine is a 570gsi, the first fuel injected model and I think the block is a vortec, the water pump looks the same. My old setup started as a 570dp, same engine as you with a 290 duoprop Basicly same engine in all of these. The vortec is a lot quieter, but I don't know why.

You would LOVE a duoprop. For me it was kind of like power trim. The idea makes sense, but you don't really appreciate it until you have one. I would no longer even consider an i/0 without a duoprop. Warning, the difference in handling, particularly backing up, with make you crazy for until you get used to it. For me the greatest advantage is low end torque. My Seabird would stay on plane down to 11 knots(oversize tabs and drive all the way down). The ability to run slow, but still solidly on a plane, when it gets snotty is a huge boon. I can't say it runs any faster, but it sure is efficient.