K-Member Upgrade

Well...it's partly out of the car!  This pic captures the early stages of my k-member swap.  This thing is H-E-A-V-Y!!!
This picture shows why tubular k-members are so light: there's hardly anything to them!  I'm going to give this piece a try.  Quality appears to be good.  It is a D&D Motorsport mild steel unit, as are the lower A-arms.  My car doesn't see lots of highway use, so this will probably be safe for in-town, occasional highway use, and running at the dragstrip.  If I decide to start putting more miles on the car out on the highway, I may try lightening the original k-member and put it back in.  I'm not sure whether I would re-use the tubular A-arms or whether I'd try lightening the factory arms.
Here's a pic of the k-member installed.  There's a TON more clearance to get at the headers, starter, etc.  That is definitely one of the benefits of the tubular k's.  I haven't decided how I'm going to limit fore and aft engine movement with the new k-member yet.  If you look in the upper right-hand corner of this photo you can see the heavy aluminum bracket that is attached to the motor mount bosses on the block.  I had an adjustable steel limiter when the old k-member was  on the car.  The factory k-member had a bracket welded to it.  The k-members are so dissimilar in shape and size that I can't re-use any of the frame-mounted part of the old setup.
Driver's side view of the tube k-member and Pro Mustang headers.
One of the biggest hassles I encountered during the installation of the k-member was my discovery that the rear k-member mounting pad holes didn't line up with the factory mount holes at the base of the firewall.  I had to take the k-member out (only once, thankfully) to elongate the holes.  I then used oversized washers to compensate for the oversized holes.