If I were you I would run the 150 until it has a problem that not worth fixing while you establish reliability. Skip the bracket (ridge can disagree, but I believe you won't be happy with it on a 20 ft hull) and focus your rebuild efforts on the Seahawk. Besides its easier to recoup investment in V20 if it's running and you can rebuild rig the Seahawk at your leisure.
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74 V20 CC with a 150 Johnson (Gone but not forgotten)
89 V20 Cutty with a Tower (Build in process)
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