Has anyone done this? i got a chance to get a set of STD late model panheads from a buddy of mine. was wondering if they will fit on my '73 shovel. he told me when he first bought his '65, there were shovelheads on it. He went and got these heads and they bolted right on. so he sold the shovelheads. so i figured if shovelheads fit a late model panhead, would it work the other way?