Are headers worth it for me?

Your gearing and cubic inches will minimize the gains that headers usually get you. You'll still make a few HP but a 3.55 or 3.91 gear and a 340/360 would see 20 HP or more.
Hedman headers hang low too. I've used them only because they were either given to me or bought CHEAP. You'll still have to fit the exhaust pipes to the headers, $$$ will be spent somewhere.