1973 Scamp Brake Question

I have a 1975 scamp drums front and rear, slant 6 225. 318 's are disc in front.
Looking to upgrade to disc in front, because I will be putting in a 318 (mild cam) with 904 bolted on all ready.
Bit of a challenge in getting accurate info on spindle swap and ball joint sizes. Some say my ball joints are already the larger size. As for disc combo kit? well...our dollar really sucks right now. Anyone have used wilwoods they wanna sell? :banghead: