When I swapped from a 198 to a 225 in my Swinger, I got a later 225. Since emissions testing wasn't necessary where I lived, I junked all that stuff.

For the port at the back of the head, since I didn't have a welder, I removed the tube, and cut it about 3/4" an inch away from the ring that bolts to the head. I hammered the remainder of the tube down into the ring as best I could, then brazed it to seal it. Then I just bolted it back on the head. Once everything is installed, you can't even tell it's there.

I also made a nice little block-off plate for the EGR valve since I was using a Super-Six intake.