[fcdriver]

You can turbo a 6 port but it isn't going to be as reliable as a 4 port. A few people have gone with the N/A lower intake manifold and used a spacer on the turbo manifold but notched their frame to make room for the turbo.
The best way I've seen is using the turbo intake manifolds and exhaust manifold. You have to cut part of the lower turbo intake manifold to allow for the 6 port, use a N/A lower intake manifold gasket for a guide to grind. You'll also need the front engine cover for the oil and coolant lines for the turbo with either N/A intakes or turbo intakes.
You can run 10-12psi on it with the right mods, fuel pump, injectors, emc or an adjustable fuel pressure regulator.

I've got a few sites saved that give a better description on the process but I'll have to dig them up later