We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common !
The 190 degree temperature issue should not be too hard to correct. It is good that it didn't go any higher at WOT. I might be concerned with 427s only turning 3,000 RPM at WOT in a 35 foot Commander. If they are fresh as you say, they should run good. My 427s stock with 1,250 hours easily turned 3,800 RPM in my 38 Commander full of fuel, which I think is consistent with many of the others' experience. Do you know the actual prop specs to help quantify "aggressive"? That would seem way agressive to me. I would have the boat pulled as part of the survey and check the prop specs and bottom condition. Has the boat been sitting awhile such that the fuel could be the problem, or possibly the carbs are varnished up? Any indication of a miss from the engines or popping from the carbs under heavy acceleration?