Hmmm, any good shops in the Washington State area you're visiting? Have the parts shipped to and installed there? "Anything to declare?" "Nope...".This was my plan also. I am planning a trip to to Washington State at the end of June. I was hoping to find one supplier for all the items I needed in order to simplify things. But 2 orders (MGW & CJ Pony Parts) is doable.
All parties deceased now, so no harm in telling this story. Back in the 70's a friend in London helped a USA based race team at Lemans. He drove his old 356A Porsche to France running a worn out VW engine. He returned with it running a very rare and valuable 4 cam 356 powerplant. You see, to French customs, all race team "spare parts" look alike.