Go with a rebuilt title. In most states, salvage is what is used for a car to be crushed. As for the odometer, just put it in. You'll be exempt in most states and just tell people that's what the odometer said when you built the truck. As for the VIN plate, go by your states rules. There are no...
I collect old automotive literature. The oldest with a definite date is the 1903 edition of "Audel's Answers on Automobiles for the Automobilist". One that I still refer to is a 1936 edition of "Troubleshooter's Handbook". Even with today's computerized vehicles, I still refer from time to time...