440 RB engine, new transmission,new bolt pattern...

are you thinking of pulling a ford 9 out of a junkyard?
i think the explorers are a popular donor for them
they come with good gear ratios, rear discs and if you pay attention, can be had with a locking unit in it

they should also come with a BBP, so that opens up the door to a much larger front brake section
either post 72 mopars, or aftermarket

too bad on the Wallonia part of your heritage, i was born in Norht Brabant, and ive always liked the Flemish tongue
what little French i knew got lost when i learned Spanish