The Dyna system was well known for issues. The ECU is buggy, and some units had vacuum leaks at the throttle shafts. I know Olthoff Racing spent a lot of time trying to make a system work on an SBF.
Made in the 2000's. I think the last ones were around 2010 or so.
If you get it cheap enough and can do the electronic and mechanical work AND have the time and tools to do so, go for it. Otherwise, run, don't walk 'cause it might be gaining on you.
