Have you tried the SPA website? There is a list of balastic plane of the era before the cutoff date in 1976. There is also a list of kit manfacturers where you can purchase the short kits or even some ARCs or ARFs. I have built a Troublemaker from Eureka and have posted a picture of it here. I have it powered with a 91 magnum four stroke. Hope this helps you find what you are looking for. The link for the SPA website is :

http://www.seniorpattern.com/