360 exhaust manifolds

I would really rather have the cast iron manifolds. I understand that the headers that I have are the low hanging type with the steering link pass through.
Yes, the 5.2 manifolds are the 2 1/4 size. These are the original manifolds to the 5.2 engine. The second set are off of a 92 Dakota. The only difference is on the pass side manifold. EGR?
Can I grind a notch in the cast iron for the interference and have the gap (hole) welded up?