Early A-body steering modification

I boxed in my idler with bracket pieces cut off of '68 and later junk K frames, worked well, but sorry no pix. That way I could use cheaper and easier-to-source '68-'72 idler arms.
I agree with junkyardhero though- those C body pitmans and idlers are longer than normal A body parts and could cause some unforeseen interference issues, as well as that C body centerlink. If you're going to run headers, I think fitment will be out the window, and if you're running manifolds then you just moved the centerlink into the only place you've got for a headpipe. Since the pitman and idler are longer, it may drop your centerlink lower so you may not have to be as concerned about oil pan clearance, but I dunno... The extra length of the centerlink and pitman/idler is going to throw your tie rod ends into some funky angles, but to what extent? Again, I dunno. If it was that easy, I don't think Chrysler would have spent the money to tool up for different parts... so be very careful there- it is your steering, and having it go away is not a good feeling.
Personally, I'd get a fast ratio box and call it good.