I just purchased a 1986 V20 two months ago with a Mercruiser 260 I/O and it has the Alpha 1 outdrive with a 19P aluminum prop. Engine runs great everything is tuned properly. I get the exact same performance that you are getting, 4200 WOT and 38 MPH on the GPS so that may be what were going to get with this setup. It does get there pretty quick though.
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