alright, few things off
Buying boots for supper cheap at a swap is fine, as long as you realize they might not work perfect. But it sounds like these have a decent chance at working for you.
First off, go to a place that knows how to cook an intuition liner correctly, and get yours molded. There are a lot of places that over cook them, don't mold them right, and do other shit wrong that you don't want to happen. So do some research into it before hand, there is a thread on tgr with a list of good boot fitters. When your looking through and you find one with good reviews but it charges $50 more to mold them then the others, pay the extra $50, its worth it. A fucked up mold is gonna cause you problems.
Second. Its an intuition liner, they pack out, a lot, especially after the first molding. Typically they will pack out more then your standard stock liner.
my guess is that the length is fine. I have no idea about heel pocket, fore foot, instep or calf though.