I went up to the museum in November to work on the engines valve covers. You would think that the cast iron valve covers that go over the rocker arm assembly would go right on. Well they never have fit right. I changed some rocker arms from the spare parts and tried all 6 valve covers on the three heads. I think that I got finally got them all fitted correctly. I also had some parts for the original air cleaners. I went to the parts store and found paper air filters that fit them. I had to make some plywood ends for them. I installed them on the engine.