I have not used the Flaming River Kit, but there a couple of things that stand out to me right away when I look at it on line.
1. The Price. Holy Shit, I am in the wrong business. $2500+ for a reverse steer Mustang II power rack and a laser cut steel bracket. They must think we are stupid.
2. This kit uses a rack with the ball joints at the ends. With the Galaxies A-arm geometry, this puts the pivot point of the tie rod well outboard of the Lower Control Arms pivot axis. This will likely lead to bump steer and is a significant departure from the original geometry.
I built the rack and pinion for my '62 Monterey (same chassis as your '63 Galaxie). I used a late 80's GM J platform rack (Think 1989 Cavalier, Sunfire, etc). The advantage of the GM rack is it is center steer. I fabricated a plate that mounts to the center of the rack, and holds the tie rod ends at the right location so as to not create any bumpsteer or other geometry issues.
I also fabricated a couple of plates that mounted the rack to the chassis, using the factory GM C-Clamps. I made my own tie rods using DOM tube, and purchased a set of LH and RH 11/16 taps from McMaster-Carr. All in, the whole setup was less than $500. Not the best pictures, but you get the idea.
I used the original FoMoCo Eaton power steering pump, and just had the local hydraulic shop make up a couple of new lines with the right ends on them For the steering linkage, I cut the rag joint coupler off the end of the column. Put a support bearing into the end of the column tube and use a Heidt's Double D universal joint and couplers. I did have to weld a heim joint to the frame to support the steering linkage as well since it took 3 joints to get to where I needed to go.
The one downfall, is the GM rack doesn't have as much lateral travel as original steering system, so some turning radius was lost. A person could shorten the steering arms on the knuckles to get that back. I never took the time, and in a 19' long wagon, people expect you to do a 3 point turn in a tight parking lot anyways.
FPA makes a set of headers to clear this particular conversion. They worked well in my car. Overall, the car handles really well, and is much more responsive than with the stock bell crank system.
