Mike,
Sorry, I have called them spring pins and have also heard them called Pivot Bolts. Anyway, they will probably be a PITA to remove and the bushings are not easy either. Get yourself some big sturdy c-clamps and use to push out the bolts and bushings. Put a socket over the bolt head to give it some place to go as it pushes out. You may have to cut out the bushings using a hack saw blade, remember they have been in there a while! Good Luck