SFI bellhousings

ive been told that the tolerances or clearances which ever way you want to look at it are this,,, the QUICK TIMES are marginal as far as being square at the trans mounting plate, ?? also that now since they are powder coated,which is standard not an option,(i tried to get it un powder coated,,for a ton of B,S. was given to me as far as reasoning,,which isnt imoprtant,,,) as far as fitment QT may be the hot item,but i was told with the powder coating some imput shafts may not reach in to the roller bearing at the torque converter register hole in the crank,,grinding or milling of the trans mounting face may be required,,???????

any one with different information,,lets hear it,,thanks