I ran into similar issues, see my two posts on Triumph Exp here:
https://www.triumphexp.com/forum/spitfire-and-gt6-forum.8/fitting-maxspeeding-connecting-rods.1608751/
https://www.triumphexp.com/forum/spitfire-and-gt6-forum.8/oil-pump-clearance-w-maxspeeding-rods.1636109/