Greetings,
Personally, I would go with the Alliant suggestion. It uses the 158 grain Speer swaged bullet; but, the weight, diameter and seating depth are very close to the StateLine bullets you have.
http://www.alliantpowder.com/reloaders/RecipePrint.aspx?gtypeid=1&weight=158&shellid=28&bulletid=30&bdid=82Regarding the old bullets, depends on how many you have and what amount of work you wish to apply.
One, put them in a old can, fill with water and boil. The grease will float to the top. Let it all cool down overnight. Then remove the grease film, drain the water and dry the bullets.
If you have a bullet greaser, just run them through and reapply the grease.
No luber? No worries, go buy a bottle of Lee Liquid Alox. Put a handful of bullets into a ZipLoc bag, squirt in a very small amount of Alox, shut the bag and give the contents a nice massage.
Once all coated, empty the bag onto an old cookie sheet lined with wax paper. Dry the bullets overnight, load, and shoot.
Use a minimum powder charge to minimize Lead fouling.
Another option is to not boil the grease away. Just lube them as above with the Lee Liquid Alox. This option assumes the bullets are not to crusty from age.
Cheers,
Dave