that's 2 sway-away coil-overs per side. that comes to around 12-1500 bucks just for the shock/spring combo. those are machined aluminum upper a-arms, cost unknown, but i would imagine at least 2-300 bucks each. more than likely, they are running really high misalignment rod ends or uniball ball joints, prolly another 100-200 per side, plus about another 120-150 for the rod ends at the frame ends of the upper a-arms. tube work could be an easy 500, plus bumpstops, plus bolts, at least grade8, but maybe f911's. then there's that little steering arm support that would have to have been specially machined for this use, i'd say maybe 100-150 bucks there, per side.

that's at the very, very least, 2500 bucks per side, or 5000 just for the front.

you could easily do fine with one coil-over with a remote reservior, or one coil-over and an external bypass shock, but the bypass shock might be more than another coil-over. you could build new adjustable upper arms from tube and use a balljoint with the same shank or an FK rod end and misalignment spacers. you could get away with just reinforcing the stock strut tower. the knuckle can be easily reinforced with a 1/2" welded plate between the steering arm and upper balljoint mount.

you could build a suspension that would perform similarly for 1/4 that estimate, or you could put a Dana 44 under there for a couple hundred, it's up to you.

never understood reasoning against replacing IFS with a straight axle.