I just noticed that there is a Oliver 7300 combine for sale in Massena Iowa 50853 looks like it is in good condition having always been stored inside.  Heads are included but have been stored outside.  I do not know the exact location in Massena but the phone # on the listing is 712 779 3396 or go to Des Moines craigslist and type Massena into the search bar, looks like a nice unit..