the HDK kit that Denny Laube sells over on forabodies is offered with drop spindles if you are looking for that. i'm pretty sure his kit uses wildwood mustangII-type 1" or 2" drop spindle or 0" drop. some autocrossers use it, but his kit is real good for drag because it has zero toe change from 10" compressed all the way to 15" fully extended.
(i.e. no bump steer from fully compression to full extension)

those kits are nice, but cost just under $3k

http://www.forabodiesonly.com/mopar/showthread.php?t=259684

you pick whatever spindles you want