Picture of what Coilover is referring to. The car picture is for a 50's PowerGlide transmission
The Hydramatic parts are rare. There has been a couple postings of people who have the Hydramatic transmission and want to purchase the steering column.
If you plan to purchase a 1954 Chevy truck with V8 wiring harness then this normally comes prewired with plug-in connections to a standard modern steering column (typically a donor from a wreck yard). If you use a stock column you have to make your own modifications and adapt for turn signals and emergency flasher.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."