Hi Mick. I'm running VN heads and got the 5260 from memory (bought them ages ago). I had to flatten the steering cover bracket slightly to make a bit more clearance.
My t400 dipstick just runs up the side of the trans and up at the rear (drivers side) of the engine. I've got a bit of room there because I'm running an electronic speedo.
From memory the Statesman with T400 ran the cooler lines over the trans and down the passenger side. I can have a look if you like and see if I can get a pic off the Parts Catalogue. Cheers Ron