440 info.

I required a 440 a complete engine,it has been setting since 1974, I took it down ,except crank rods pistons. The heads # is 2780915 the block has #s on the block next the dist. that are c440 below that # IS 9-12HP, it all so has HP stamped on heads on the bolt holes. I am new to the 440 thing, the pistons are flat top with out any valve reliefs They have a # L2310 ,it has been bored 0.30. Can anybody tell me is a high compression or what ? Is it a keeper or a ancor? thanks.:cheers: