Paul,I had a chance to visit Gary in Costa Mesa a few years ago. He gave me a tour of his facility including the road racer you speak of (great looking car). He is very easy to talk with and easy to reach. He advertises in Y-Block Magazine for a C-4 conversion kit and his phone number is listed with it.
He used to race it at Willow Springs (in the Mojave Desert) in a vintage class of SCCA. He did quite well and told of leaving scrubs coming out of the corners. But, I'm like you, I haven't heard much about him or the car except for the ads in Y-Block Magazine.