Milodon Pick-up tube

here are 2 questions regarding above:
a) what dipstick to use? Is it mounted in a predrilled hole in the block on the left side?

b) my right buiscuit mount doesn't fit correct, hitting the oil filter blocking plate. Do I have to cut it to fit? Anybody else with that prob (if a prob at all) ...? The bolt in the right side buiscuit should approx 0.5" lower than the left one, right?