spindle question

I have started to build a 64 valiant 2 door post that will get a 340 for power and a 8 3/4 rear end with 4 wheel disk brakes it has 9 inch drums on the front right now . A friend has a willwood set up that is new in the box he will let me have cheap but its for 65 -74 with 10 inch brake spindles my question is will spindles from a 68 barracuda be a direct fit with out changing upper control arms sory for the long post :banghead: