Your advice on rebuilding a 350

[bosco200]

Hi I have a 1972 C20 with a 250 I6....im wanting to put a new motor in...possibly a 350.....But my dad used to have a 1972 C10 and it is just sitting in the woods with a 350 sitting in the bed of the truck.....So I was thinking of tearing that down and rebuilding her....but since its been sitting in the bed of his truck for around 25 years, in the rain and snow (it is sitting under a tree though) would it even be worth it?