Tim, I did the same with the 33-34 front end on my '28. Can't tell from the pic, how did you fill the hold that goes through the center of the king pin??
I knew about the piston ring, I didn't know the part that goes on the spindle was a valve seat. I ordered the kit from Speedway. It comes with no instructions. Didn't say anything about filling the holes in the backing plates and re-drilling new holes.