Two barrel intake question

As far as the engine, you can check the numbers on the block, both the casting and the stamped numbers. Later engines (late 70's) didn't have the separate spark plug tubes, they were cast into the block. I think early engines had forged cranks rather than cast, which is preferable. The 80's engines started using hydraulic cams, which is not desired since I don't think any hydraulic performance cams are available.