This and the other MPC Funnies of this series where supposed to be based on real cars. This was supposed to be the Tom 'The Mongoose" McEwen funny car. But the license cost got too high and MPC could not afford it. Thus generic paint for them.
But I do like the USA theme!
Looks like the Ford again, unless they dug out the Pontiac or Caddy for it. But due to the lack of detail on that artwork blob of an engine, who knows!