Heavy Armor and perks, as well as all 2 perks, how effective would Nord Hero weapons and ancient nord armor be?

You would have the 80% damage cap once your armor rating hit 567. Any higher and it's not doing anything.

You don't need every Smithing perk to get something to Legendary.

I know. But if I had 100 in smithing and 100 in heavy armor and two handed, how effective would that gear be?

Pretty effective I guess. The armor would easily pass the 567 mark, and the weapon could probably go over 150 damage at most.