Welcome! Reading this reminds me very much to the start of my build. Here's a couple of things I've learned along the way:
I spent pretty much all of last year and too much money trying to sort out a few things to get my truck drive-able. In the end I tore it down to the state it's in now and building it right the first time.
Building it right the first time might not be the best way to go
Its now going to cost a whole lot more money and take more time than I originally hoped for. But it'll be the truck I want.
Also finding this board is either really good...or really bad. There are a ton of great trucks, a wealth of info, and some really good dudes on here. However it can have a tendency to cause your project to spiral out of control. Trust me, I speak from experience
In all seriousness, you may want to check the VIN on the frame rail and see if it matches the glove box or VIN on the inside of the driver's door. My first truck ended up being a '67 swb frame and VIN tag but a complete '71 long bed body.
Good Luck!