Hi, René.
I just put a Hydroboost from Bronco graveyard on my 1985 Bronco. Set up as a direct bolt in without modifi action to brake pedal, etc.
Other people might have different options. I like the Hydroboost.
As I understand it, the booster is actually made by Bosch(?) and the fabrication adaptor plate and hardware that bolt directly to the older ford trucks is made by Hydratech.
I would call them if possible and see what their turnaround time is as it took me 10 months to get mine. It was also during the end of COVID, etc.
When I bought off Bronco graveyard, it was ~$900. The last I looked it was closer to $1300 now.
I don’t know what it would take to upgrade the rotors/caliper setup with these front axles.
William