Wel, I have bad news and more bad news. It is going to be extremely difficult to mix/match pre '70 brackets with '70/later balancer and water pump. EVERYTHING changed in '70 ... EVERYTHING!
Both alternator brackets, all the PS brackets, the water pump, and the dampner all changed in '70. It's pretty much an "all or nothing" deal. You can use the '69 PS pump with the '70 balancer if you run a conversion dampner. Otherwise, it's all '70/later, or all '69/earlier. No parts interchange.
You can use a '70 bracket with a '69/earlier pump, but you'll probably never get the '69 bracket to work. You have to cut off part of the '70 bracket, where the return hose attaches.