About $4400 for head, manifold, valve cover, thermostat housing. Unless prices has changed?

He had a modern throttle body manifold for sale.

As for the rest, prices can vary all over the place.

Mike has , rods, (pistons, designed for his 12 port head), cams, & more, most all you need for your 6 build.

MBHD

12 port SDS EFI