Todd it's looking killer!
The lower DSE mounts are .5" lower than stock and yes they add to the fun! I had to raise the tranny tunnel .75" to clear my T56. I also noticed that a one piece trans x-member doesn't work with them either...good thing I have one of Tyler's 3-piece x-members!
I wouldn't use the lower body mounts again as it's not worth the issues they cause. I had to cut a perfectly good trans tunnel to fit the T56...not what I had in mind when I was shopping for a rust free car. Kyle did offer to swap them out for the full height but I already had the DSE SFC's installed and figured I should just cut the floor...live and learn!