During the period in which a demonstration project established under subsection (a) of this section is being conducted by an Indian tribe, the Secretary shall award all health care contracts, including community, behavioral, and preventive health care contracts, to the Indian tribe in the form of a single grant to which the regulations prescribed under part A of title XIX of the Public Health Service Act [
42 U.S.C.
300w et seq.] (as modified as necessary by any agreement entered into between the Secretary and the Indian tribe to achieve the purposes of the demonstration project established under subsection (a) of this section) shall apply.