renovating a boat

[locdog8169]

i got a question for any boaters out there that have renovated or repaired there own boats, hopfully you guys can help me,

me and a friend recently bought a boat to renovate during the fall and winter nights, the fiberglass is in good condition but all the wood is rotted (floor, stringers, transom) we have already stripped the entire boat and pulled all the wood and and have already rebuilt the stringers and the transom and are ready to glass them in. my main question is where do we use the flotation foam, i saw on a couple web sites to pour into the whole bottom but in our book and in a few other sites i found it says to leave the bilge channel down the middle open and only do the the 2 sides it is a 1970 glastron v170 if it is of any help, we only paid 475 for the boat motor and trailer and the motor was running so i think we got a good deal, we have the time to put in so we didnt mind that it needed alot of work,

any help you guys could give me would be greatly appreciated,

thanks,
loc