My father and I are considering upgrading from our 9610 to a 9770 sts. Our biggest question is about our current headers. We have a 853 all crop, 843 corn head, a 914 pick-up and we just purchased a 30 ft. MacDon Flex Draper. Will any of these heads work on the newer combines? Are any of these heads big enough for a 9770? Any other comments or suggestions would be appreciated.