67-69 Dart owners. Bumper to grill gap

New 68’ grill from YearOne and new front bumper from AMD. I’m having a little difficulty getting the drivers side to sit right. Wondering what the gap should be between the bumper and the grill. 1/4“, 3/8”, 5/16” etc? Also, is there a particular bolt and bracket tightening sequence? I know they can slide fore and aft. Very little up and down play. Thanks for the input.