Location for 3" Tube on Pass Side, 70 Duster

Not sure how much is different, but i have a low deck big block in my duster, car was a slant 6 with 904 trans.

No different. Now that you mentioned it, the fact that it was a /6 is probably the problem. The exhaust divits or whatever they are called are not near the correct position for the V8 headers. I will have to see what I can do. It will take time for sure.