There was a R&P option went the "other guy" was building them....I believe the front spindles had to be re-welded to allow for the front steer ....move the tie rods to in front of the spindles..
Looks like in the picture they are using a whole different Spindle?
Possibly Mustang stuff? The guy at Mancini had absolutely NO information on the set up accept that the K Frame comes from Qa1 this way ready for front steer.
It seems to me one of these could be put together for a whole lot less than $3500.00 if we can find out the parts used.