I don't know if you tackled this job yet, but I have the same boat and did the same job. Pulled all the old foam, fixed a few rivets with solid marine rivets, sealed with Gluvit, and redid the foam and floors. I went with an idea I saw on the starcraft restoration forum over at Iboats. I used the blue closed cell 4x8 sheets. Laid them lengthwise along the aluminum floor supports. Cut them off flush. Tucked them all in tight from side to side, bow to stern. Wherever there was room, I stuffed more cuttings in. Once you secure the floor down it's rock solid and the foam on edge provides a bunch of hull support. Ended up way cheaper than the 2 part epoxy, which we all know breaks down over time.
Cheers.