I would think the throttle linkage would be very similar. I'm not familiar with the '38 setup, but the later AD trucks used a little sheet metal bracket under one of the pan bolts for the return spring. Here's a couple pics of the linkage on my engine for comparison.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
