Torque numbers must be off the charts. Based on the higher compression (stock 427 is 8.9:1), cam profile, higher compression, larger cubes, and fuel injection, you have a pair of serious big dogs aboard your boat for sure.
I ran 23x23 4-blades on TRADITION (38 Express with stock 427 power) and I could never reach 4000 rpm with them. The boat was overpitched (or shall I say, "overpropped") but it sure ran sweet at lower cruise rpm. Stock prop on the 38 is 23x25 but I figured I should drop down two inches for the 4-blade, but the added friction of the 4th blade just gave it too much bite for the stock motors. With the 4-blades however, the boat would come out of the water and get on a plane as fast as a runabout, even with a slight throttle. At maximum torqe on the stock engines (2900 rpm) it would run all day long without breaking a sweat. Still, I know running with an overpropped boat is not good for the motor and I never really pushed it much that way. I am running stock 3-blade props now and plan to take another inch of pitch off my 4-blades when they are balanced and reconditioned. I think they give an advantage in the cruising range I use (we rarely exceed 40-miles per trip on the Cumberland, and on occasion we'll do a 110 up and back to Old Hickory Lake.
I can't tell about looking at your hardware if it is a functional PCV system or whether or not those are just vents you are using. I run a similar situation on TRADITION but one is a functioning PCV that opens with suction from the carb/manifold and the other is just plumbed over to the flame arrestor in case anything decides to come out at lower rpm where the PCV might be closed. My system still allows a "positive" cross ventilation. If your system is using non PCV vents, I would suggest adding one of these http://www.jegs.com/i/JEGS-Performance-Products/555/52225/10002/-1
directly to the suction side somewhere on the intake manifold where it will NOT lean out the mix at WOT, and letting the other one stay as it is. Far be it for ME to be giving advice to a P.E. with motors like yours, but hey everyone has an opinion.
I see you stuck with the iron intake manifolds. On one hand I wonder why you did not go to the RPM style Eddy when you went to what some would call extremes with cam, crank, injection, and compression, but on the other hand the iron intakes are pretty well suited for torque. All said and done, your machine is approaching something like the Starship Enterprise, Scotty would watch over things when you get to warp speed.