Mobileortho - I mean the control arms. I also had to take 1.5" out of the steering center link when I narrowed the front crossmember. Mine looks just like yours. I have studied your photos to learn what I could before I started modifying mine. I will take some photos once I get all the bugs worked out of them.
I am trying to get the front crossmember about 7.5" from the floor. That will set me level with the flipped rear end. I have 3" dropped Belltech spindles and have cut 1.5 coils from the stock springs and I am still not low enough. I may have to install airbags on the front, but I hate to add the complexity of the compressor and controls.
The interference problem with dropped spindles on the 73-87 trucks is a common problem, especially with smaller than 17" wheels with more than 3" of backspace. Check out the 73-87 truck forum suspension:
http://forum.73-87chevytrucks.com/smforum/index.php
