Acclaimed writer and Shelby historian Austin Craig has two articles in the 2014/15 Shelby Annual that both mention racer Dave MacDonald.

This first one highlights the conversation Carroll Shelby and Dave MacDonald were having when Dave first mentioned they should build
a lightweight Cobra to run in the modified class.

Second article in the 2015 Shelby Annual talks about the amazing Peter Brock designed Cobra Daytona Coupe that led Shelby American past
Ferrari and the '65 world championship