Today I got the time to put the 312 and merc-o in my car. It was tight to put it in as a unit but it worked. Now ill hope to get al the surrounding items in place during the next week. I'll have to find a shorter oil filter to fit in though, it was 2 inches lack of space...
Try a Ford Motorcraft FL-300 or Purolater L10018 or NAPA Gold 1068 these have the same base and are shorter.
I'm using Mann filters in my car cause I sell them at work and they are good quality stuff... I'll just have to check my books tomorrow to find a shorter one than the 1 I first bought...