Headers won’t fit in 67 440 dart

I know this sis a stupid question, but have you tried swapping brackets and or mounts from side to side? Are you 100% SURE you have everything on the correct sides? I know a lot of people run into that even with stock brackets and mounts sometimes. Just trying to throw something out there.
No I looked at that as well numerous times but iam burning the candle at both ends these are the directions I got with the mounts. I think I have them right. But I did notice that the motor is sitting kinda crooked on the k member. Not sure if that’s normal or not. Or maybe these are the wrong mounts ??

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