As soon as I saw "Cardone" I felt uncomfortable.
I've done about 3 or 4 of these WJ conversions. and a 95 to 96 conversion.
Junkyard sourced parts, making sure I got the set-up with the flexible lines included.
Yes, the firewall needs to be massaged with the WJ booster.
There are other advantages though. Seems more powerful than the 95 to 96.
You don't need to rearrange stuff in the engine bay. Pedal is the correct height.