Turbo technics and eichberg made some kits for the cologne engine. But those were bigger engines running lower compression 9.0/8.9.

I thought there was a guy on this forum which had a green turbo granada 2.8 with carburettor. Should be some where between al the project.

Maybe it is worth giving him a PM.

I know a guy in holland which has/had a turbo kit for sale don't know if he still got it. he is hardly online on the forums these days.