I just got my tremec 3550 in, and it's mounted to my 351W dummy motor. I've got the engine as low as it can go without hitting the front crossmember. I don't see how I can get my engine at the recommended 3 degree down angle without having the output shaft above the frame. About the best I can do is 5 degrees. I'm about to go home and recheck all my measurements and make sure the frame is at the correct ride angle (since the body is removed, and the tires on the front are bigger than final size).

I'll make some pictures and post them tomorrow. Maybe that will help with visualization.