I know this has probably been covered a thousand times before, but I have an idea that would be easily retrofittable and could even be made 100% mechanical with no need for electronics what so ever. This system will essentially work on ANY non shaft mounted rocker arms (yes, SBC, SBF and mopar) Cost shouldn't be too bad, as there isnt much complexity or need for a whole slew of new parts. Some minor modification to the cylinder head and valve cover, but other than that it should be a bolt in affair.
I have spoken to an engineering firm about this and they seem to think it is feasible enough to at least warrant building a prototype. I am also waiting to speak with their in house patent attorney about filing a provisional patent, at which time full details will be released. It would essentially do what the intake side of the vq37hr VVEL system does, except a lot less complicated, and easily made to work on the exhaust side as well.
So, any interest?