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

I am studying the possibility of transporting the Currie Ford 9 '' axles to Belgium.
probably with drum brakes at the rear to be able to pass more easily to the technical control here.
and dream of ordering two relationship. 3.90 and a 3.50.
the Detroit Tuetrac system seems to me a good choice for the road.
what is your opinion on the type of axes?
28,31,35 spline?
I am thinking of opening a new article with all my ideas concerning the projects of my future engine, gearbox, rear axles.
your opinion and knowledge is very important to me.
despite I am an engine specialist, the choice of possibilities in the USA is quite simply gigantic, and I cannot afford to make too many mistakes, because it costs me almost 3 times more expensive here in Belgium each time the piece arrives here