Header dilemmas- 67 Barracuda FB w/383

I like the idea of manifolds but aren’t locating any to match my heads. The headers that I have may just be surface rust but I’m fairly certain there is a part on the driver’s side that is rusted through. Is that repairable? I tried to search for results of repairing headers but my wording might not be right. I also don’t like that you can see where it connects to exhaust under car, looks massive. That might just be an issue of profile, suspension, etc I haven’t learned about yet.
It is repairable ! My suggestion is to have custom headers made with slip connectors for ease of service . I am aware they are expensive (about $1,00000) but in the long run you will be ahead . After they are made have them coated inside and out . Done , done and done