I am pretty sure your stock carb would be an updraft Carter RXO for the truck. They are available, but not cheap.
There is not a lot of literature that I am aware of on these trucks. They are for the most part very similar to the cars of the same year, in this time period. Parts Books for the 4 cylinder era will help (eBay), as will the Repair Manual, although it doesn't have near the detail or illustrations of later years. 'The Filling Station' does offer a reprint of the Shop Manual for the 25-26 truck for $12.
http://www.fillingstation.comI have no idea what would be correct for your truck's springs.
And don't feel dumb. Nobody ever started into this knowing what they need to know - or else they probably wouldn't have started. Ha! And for what it's worth to you, at 65 you are a relative youngster in this crowd.
You will probably find this Chat Site to be one of your best resources. When you run into a specific question, post it. Ususally, you will have an answer within a day. Many of the people who post here on a regular basis also supply parts - as a hobby or sideline business - and there is a strong community of 4 Cylincer era people that are very active in the VCCA. They are happy to direct you to sources for parts or services or knowledge. Good luck!