anyone who knows about a spirit of 76

[SPIRIT OF 76 CHEVY]

i just got this p/u i been trying to find some history on it i would like to know if this package makes the truck more rare or valuble its a bonanza swb p/s a/c tilt clock all the chorme trim rally wheels from the factory 350/350 auto the spirit of 76 package on this p/u has a red white and blue seat and blue door panels whit a spirit of 76 emblems and white sun visers the build sheet is in the glovebox and it looks like it just was printed the truck has 87k org miles i got it from the org owner never had any body work it has some rust in gm spots i drop it off to bodyshop its geting redone the some way it left the factory the seat in bad shape an i want to keep it factory but i dont know if i can got thit seat cover if anybody knows more about this package plz let me know thanks