History Lesson: Mazinger Z (also the first of the Super Robots - Tetsujin28 doesn't count, he had the pilot safely outside using a remote control - was born a day Go Nagay was blocked in the traffic of Tokyo, and thought "Ah, If my car had legs, I could suinply walk away... And if it had arms, I could simply trash all other cars...". First version of Mazinger Z, so, sorta *was* a car! (also, while the body was more or less the same, the head was a small car)
Well... Grandpa Z is kinda the first Headmaster out there... Dunno about 350Z, but I think you could fit Mazinger Z int truck+trailer altmode... Though he still will be about 3 meters taller than Ultra Magnus or Starsaber.
Sora ni Sobieru Kurogane no Shirou
Supaa Robotto Majingaa Zeto
Muteki no Chikara wa Bokura no Tame ni
Seigi no Kokoro wo Pairudaaa ON
Tobase Tekken Rokketo Panchi
Ima Da Dasu n Da