Headers for 1967 Dodge Dart

Some Summit brand headers would be inexpensive and a starter from a mid-90s Dodge truck with a gas V8 would be about $20 from the wrecking yard. Just make sure to get some quality header gaskets like remflex...
You could maybe find some dugs headers on sale for around the 350 $450 range that would go in a tick easier and give you maybe another inch of ground clearance and the same size tubes...
Then you could go all the way to TTI headers which would probably be a bit easier to install even more and by the time you got everything said and done be into it close to 800 to a thousand dollars and they may have a tick bigger tubes but nothing you would benefit from with a 318...
Keep in mind this is my very first post on this forum ever and also keep in mind my username so take that with a grain of salt...