Small block. I bought a Mopar performance 5.9 magnum short block, still sealed in it's crate from 1999. I'm a welder by trade, and haven't built an engine since 1997, but I would assume that it'd be a good idea to at least go thru it, and verify torque specs.The engine came with closed chambered heads, with 2.02 valves, and an FI intake. I just don't know what to buy to put on this for a good street car/ daily driver.