looking for clearance around the transmission

Losing a little more ground clearance due to the header being too low sort of crosses the line.  I remember once I lowered my mustang it got to be a pain.  I had to think about my route in advance because a parking lot entrance, some pot holes, etc could ruin your day.  It hit the ground all the time going over bumps in the road, and I once ripped a muffler clean off.

The good news is if the header goes up 2.5 inches it will be against the bottom of the car and block access to the subframe bolt which is equally unacceptable.  So I think I am looking for at most an inch up, which will put ground clearance back at 4.25 in. I think I want to increase clearance on the driver's side about an inch.

To get a good view of what collides and help me decide my plan I removed the engine and the bell housing: