Looks like Speedway Motors now offers a bolt on gasser kit.
http://www.speedwaymotors.com/1962-67-Chevy-II-Nova-Bolt-On-Gasser-Axle-Suspension-Kit,64330.html
Jared
http://www.speedwaymotors.com/1962-67-Chevy-II-Nova-Bolt-On-Gasser-Axle-Suspension-Kit,64330.html
Jared