Pontiac's famous X-400 show cars ended their run with the '64 edition, and we resurrected the concept for a one-off, never-built '66 version, as seen in an earlier edition of What If? This time around ...

Nobody needs to drive a 1970s-vintage American landship. They don't need a 400-cubic inch (6.6-L) V8 that treats the average gas station pump with all the hostility and prejudice of a swarm of murder ...