what kind of vehicle is this small block chevy from? I cant find it.?

Go look for yourself. There are many sites out there that interpret such info. Try nastyz28.com for one.

I know the casting number, 3970010 is a 350, that's for sure. some were 2 bolt, some were 4, some had forged cranks, some had cast. It is a really common casting, seen a lot in the 70s

Seems that it must of been from the Flinstone Mobile