Anyone here ever used Gerko 5/6 speed kits?

On another forum, I came across this company who makes 5/6 speed kits for A/B/E body mopars. I was wondering if anyone here has heard of them or had any experience with their kits. On the website there is a duster that has used one of his kits.......it looks familiar.....maybe a member here??? Check out the link below.

http://gerkoenterprises.com/index.htm