"So should I put a build tread in the truck section, or the street rod section?"


myself would suggest the street rod forum. maybe both if it's allowed ?
i see what you mean about moving the rear cushion backward.
however if the top of the seat is now touching the brace that runs from the rear window to the floor [that was possibly for the gas tank ?], taking that brace out would allow the seat back to go maybe another inch or so rearward, still allowing the back angle that is comfortable for you.
just my thought from far, far, away. it may be entirely different seeing it in person.


now back to our originally scheduled program..................