"..I didn't realize the '48 had a L134 in it originally,.."

The F-head engine was introduced in the wagons in 1950 and in trucks in the "1950 1/2" models when they changed the styling on the nose and the panel layout from the square cluster to the clock and bar cluster.

The carburetor went from driver side to passenger side and I'm still not sure exactly how the original linkage was routed. My throttle return spring setup is a bit of a Bubba and Junior rig, but it works - so far.