What headers will fit???

I have a 73 dart swinger with a 360 727 combo swapped in. I bought Doug's 453-r headers and the drivers side is not fitting, hit the gear box and oil pan. I have a milodon 8 qt pan, qa1 subframe, stock gear box rebuilt by firm feel, schumacher engine mounts. Is there a set of headers that will boltake on and fit? Or do they all need some modification, these Doug's look like I need to cut and modify to make work....had 3 exhaust welders look and they all rec switching to manifolds lol that would be easiest....I see the schumacher headers would probably be best but they are on 4 week backorder......is there anything else?