In my restores I pulled out all the foam except for what was in the stringers. There I dug out the foam where the factory fill holes were and drilled holes on the inside of the stringers and let it drain and dry out. Replaced what foam I dug out stringers and glassed up the holes. Be careful if you are going to be foaming your gas tank in. Especially if its aluminum. I would not suggest it. I never noticed a big difference in ride or sound in my 20' or 23' w or w/o foam. It really just there if you capsize to keep your boat floating. I would also glass a couple kness from the transom to the hull
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