I am told the Ultrabell makes the pump leak no matter what since the pump bolts hold it in place, and they also vibrte loose. If I use the adapter plate, it may have to be trimmed down a lot for header clearance which is no big deal, but not crazy about having to cut the factory GM bellhousing to fit the starter, unless there is a starter I could use that would eliminate the . Both seem to have +'s and -'s, just looking for some opinions based on actual experience. The UB just seems to be a much cleaner approach, and I already have a case that is cut.