The 1935, 36 &amp; 37 HP 70's all use the same style oil filter base and filter - and that is attached to the right front side of the engine - with the filter sitting vertically.  The top of the filter is just about even with the top of the governor 
Get a copy of the Oliver "70" Shop Manual.  Page 2-2 shows the later style "3 gear" engine and page 2-3 shows the "5 gear" engine that you should have.
After much searching, I finally found an oil filter that will fit the narrow confines of the 5 gear space - and that is a Fram C-253.  If you don't care about the looks, the short little WIX 51106 will work.
Hope you will bring her back to life.
Good luck