There is in green plastic a 1960-ish Revell Austin Healey 100-6 "In Racing Trim" "Competition" re-release of the late 1959/1960 Revell standard sports car kit. The Revell "Competition" series included a few prior kits altered in small ways to reflect a racing configuration.
Ebay commonly has one or two very expensive examples of this green plastic kit on offer. Rarer still is the same kit, but "motorized". This included a motor in the trunk, driving a worm gear that drove a standard gear on the axle.
The Austin Healey isn't American Muscle per se, but a few were cut into gassers. Most notable of these is Rob Ida's, "Hemi-Healy". The misspelling by Ida was intentional. Only a few old photographs of the car exist, but satisfying stories still happen in this world:
Ida sold the car prior to the birth of his son. This son and Ida would come to restore cars and scratch build Tuckers. The son had a son, too, and this grandson found the original "Hemi-Healy". Acquired and restored, the "Hemi-Healy" once again races in its original form and colors (er, orange, not green).
The restoration is extensively documented on Facebook, making a tribute build much easier today than just a couple years ago. Of course, one could spend $100.00 on the green Revell kit for such a project, but the 1990s and 2010 re-release of the sports car (white plastic) or the 1980s fat-tired re-release (red plastic) can be bought more cheaply.
Matchbox also offered a white plastic issue in a short-lived arrangement with Revell.
All are 1/25 scale.
The family business can be found with a search for "Rob Ida Concepts".
An Ebay search of, Revell Austin Healey Competition, will find the green plastic kit. Omitting the word, Competition, will yield the other kits.