With a solid front axle you'd contact Mor-Drop and use the stock front axle dropped maybe 3 inches.

Mor Drop
600 29th Avenue
Oakland, CA 94601
(510) 261-1888

I'd use at least 16s and suggest a 2000 12" Crown Vic brake disk over the stock hub, using the CV police calipers and brackets with custom mounts and hoses.
That's what I'm planning for my '64Dog.
Out back I'd find an 8 3/4 from '65 or newer and use one of Dr.Diff's disk kits on it. Or maybe the stocker would work?
Funny how with the right grille the truck looks almost modern! How about some late model Ram headlights?????

R.