I was actually looking for this same info because I was looking to do a GEN 3 Hemi swap into a '65 Cuda. HDK/RMS/Bouchillon Performance all feel like $5K is where the pricing for Double A-arms, tubular K members, big disc brakes, and coil overs should be. I was actually looking into fabricating my own set-up using traditional hot rodder components that are more readily available and a co-worker's Plasmacam, my tube bender, my welder(s), and a tape measurer.