I am familiar with that kit, but did not know that it was offered on anything other than the '82 series tractors.
What is it worth? According to most people that have had it, not worth it's weight in scrap. There is a member on here that goes by Spudder. He had one on a 782 and it didn't work well at all. It uses a shuttle valve to control the hydraulic pressure and it didn't center well, respond well, or drive very straight.
How hard is it to install? Well.... looks like you have the instructions.
