I've just finish drilling both holes ( one on each side of the frame)

The first pic shows how far I could drill with the frame gusset hitting the bottom of the hole saw.


Next pic shows what's left after I use drimmil tool with the metal cutting disc to cut. ( I used about 1 1/2 disc per side. )



Last is pic of the gusset piece that came out after drilling through the frame.



I've discovered that after you have attached the spring hanger in the front, you can attached the springs to the hanger( I used 4" AllPro springs ), with the shackle attached, to kind of line up the hole so it's parallel. I used a jack to support the springs. The interesting thing is the spring never touch the lower IFS A-arm.

I didn't think of taking the pics of it while it's up...sorry.