Sometimes they are a motherf---er to get off. I just found a place to use a prybar with damaging anything and it will come off. Sometimes I also use a rubber mallet and hit a few times around the alignment pins and that works for me also.
maybe try sprying some PB blaster where the pins are and let it soak in for a few minutes. after you get it off, would it help (in the future) to put anti-seize on the guide pins?
__________________ Rule to live by when buying or selling:
if you get a pm from a potential buyer where it is difficult to read (spelling, grammar) then you may want to skip that person and go to the next. As you can now see it can be a reflection of the mindset of the person who has contacted you.