Have you looked at the Mast Motorsports Oil Pans?
http://www.mastmotorsports.com/view.php?id=160&c=49&s=7
Seems like I heard somewhere that they have a little more clearance than the F-Body pans. But it's always good to move the engine back like you mentioned for weight distribution.
What did you come up with on the spindles? You had mentioned a few posts back that you were developing your own since the CPP MOD spindle didn't work out....
Everything is looking great BTW.!!!!