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What is the issue leaving blocks of wood in the hull? There is wood foamed into the hull now?

Probably no issue, but when you have a solid piece of 2x4 wedged on end between the bottom and the floor, you create a direct shock with no give if you take a hard hit from waves. The rest of the hull
will slightly compress and the shock would be less, it stands to reason. Might eventually crack the deck at the point of the wood. It just doesn't seem like a professional way to do it. The deadwood in the hull is to screw things into, and its a piece of plywood glued to the underside of the deck..

The best thing to do first is to remove all of the wet foam, and see what you have. It might be like a wet piece of baloney, or it might stand by itself. Then a decision can be made how to deal with it. I'm only trying to help with some ideas, I don't know what you're looking for, ideas or just a confirmation of your ideas.
Good luck with your project.