Plus one for the air-cooled VW. We just bought a 1981 VW Westfalia, which has the same 2.0 liter engine as the Porsche 914 I owned thirty years ago. It's like coming home again. Dead simple, and the instructions for dropping the engine don't cover even two pages. I've always considered the Bosch fuel injection of VWs and Audis, no matter what version, to be problematic and a general pain in the ass, but it mostly works most of the time and is the only potential sticky part for a newbie.

Parts are still readily available, though anything that moves under its own power is likely to sell for more than it did new (which wasn't much in today's dollars). But you'll get smiles and waves anywhere you go whether you end up in a Bug or a Bus.