Excellent work. I'd personally just leave the firecraker antenna on as I'm sure a few got changed out over the years. The trouble with the whip antenna is you go through all the work to install it and then it's almost invisible.
My limited understanding of the Horst system was that it was a combination of air feed system and filters. It was used by the IC and MILW on rebuilds as a way to force more air into the engine in place of a turbo, which supposedly developed about 100 more horsepower than an inertial air intake/filter. It was developed in Germany and used there for a number of years. The ox-yoke shape was to prevent snow and dust from being forced into the engine compartment along with the air. This required a fairly complicated filter and baffle arrangement. They became a maintenance nightmare for both the IC and MILW and all were eventually converted to just an odd looking intertial filter system.
My limited understanding of the Horst system was that it was a combination of air feed system and filters. It was used by the IC and MILW on rebuilds as a way to force more air into the engine in place of a turbo, which supposedly developed about 100 more horsepower than an inertial air intake/filter. It was developed in Germany and used there for a number of years. The ox-yoke shape was to prevent snow and dust from being forced into the engine compartment along with the air. This required a fairly complicated filter and baffle arrangement. They became a maintenance nightmare for both the IC and MILW and all were eventually converted to just an odd looking intertial filter system.