Best fittting headers for 69 340 GTS ?

About using the mini starter, I just used a starter from a 90s dakota dont know how long it will last compared to a higher end mini starter, but I got it for cheap, but I can easily install it with the headers in.

I remember installing some cheepie headers in a car and they definitely required some "persuasion" and then I installed my dougs, couldnt believe the difference, well worth it in my opinion.