Zingers! (that is what they are called) Built in the early 70's they were used as promotion in the ISCA hot rod shows.

from http://treswright.vervehosting.com/Pages/Page4.html and http://elcistebravado.blogspot.com/2010/10/big-engines-or-small-cars.html

Thanks for helping me Michel Chaput, Pat Redmond, and Br'er Shaygetz who all let me know a bit more about these! Much appreciated!

MPC put them out in the 70's.
MPC's current owners, Round 2 Models, re-released them earlier this summer.
http://www.round2models.com/models/mpc