84 and 85 are the best front axles to get, thats the year that they started to truss them from the factory, so there stronger.
79 to 83 will work just fine, im using an 83 for sammy.
But if your going to run an 86 or later rear end your going to need some 1.5" wheel spacers for the front, due to the 86 rear end being wider by 3 inchs.
Hope that helps
Amilla