25-year old Burnham Series 2, Model B Boiler: Parts and reliability possible for another 10 years?

Have a 1999 Burnham Series 2, Model B cast iron boiler... with the remodel tightening up the home, have a few challenges around combustion makeup air and moving from a high temp system to a Mid + low temp hydronic heating system. Would prefer to hold off on replacement, but not if I can't practically get another 10 years from it. - Is it practical to think I'll be able to get parts for it for another 10 years? - With this particular age and series of a boiler, is another 10 years of life without ongoing issues reasonable to expect? I will say I have done very little service in the 8 years I've owned the home :(