I'm wanting to ditch my OLD low hanging headers, are these manifolds worth it?

For me, to help decide, knowing the cam specs and if the heads are ported go a long way. Not knowing puts things in an iffy spot. Also considering the shipping to AK and the amount of work you’ll out into it gambling that it’ll be good and OK leaves me gambling as well on the advice I’d hate to screw up on anyone.

I also hesitate to just say “Go for it!” but that just might be the case here. I personally never had an issue with exhaust manifold performance but it does fall into a certain level of performance and intended usage.

Good performance can be obtained with exhaust manifolds. It is something normally that is thought out beforehand.