2010 Ford F-150 exhaust leak

I noticed my truck was making a ticking sound, which turned out to be an exhaust leak because I had a crack in the manifold. I researched the problem and bought headers to replace the cracked manifold. I replaced the passenger side manifold first since it was the most difficult. However, my truck still has an exhaust leak. Do you think it is the gaskets that should be changed? Thank you

Yes, if you replace a exhaust manifold, you should replace gaskets at the same time.