One set of holes is for small blocks and the other set is for big blocks, is what I have been told in the past. Also, it looks like you may have the motor mount brackets bolted to the front side of the ears on the block. Pretty sure they always bolt behind the ears. There should be a nub on the bottom of the rubber mount, along with the stud that goes thru the hole in the frame. The nub should line up with the dimple in the frame if I remember right on truck mounts. I do know that you need to leave the rubber on one side or the other a little loose to get them all to line up, then tighten it back up after you get it set down. Good luck.