You may want to sell your truck in the future. If a 5'6" person can't reach the pedals then it loses value.
You want your head to be several inches away from the rear of the cab with the bench seat springs compressed (heaven forbid, someone rear ends your truck).
Your stock seat tracks bolt to the floor. I would study making an adapter, that can be added and removed, without modification to the original tracks.
The 55 2nd floor doesn't have the rear barrier or panel that the 55 1st has.
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1955 2nd floorboard.jpg (46.07 KB, 79 downloads)

Last edited by buoymaker; 10/13/2022 6:35 PM.

"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."