We have a member here with a small block turbo car who is intending to build exactly such a kit. I would guess he will see this thread at some point.
I think the kits are built, he is just testing before making them available....I am waiting patiently to see what happens with them, as my 408 is coming out this winter for a refresh- if the kits are available, it might just be getting some new pistons and turbo cam along with one of the kits
