Programs , $1,000,000,000, to remain available until September 30, 2022, unless otherwise specified, for activities and assistance authorized under title I of the Native American Housing Assistance and Self-Determination Act of 1996 ( NAHASDA ) ( 25 U.S.C. 4111 et seq.) and title I of the Housing and Community Development Act of 1974 ( 42 U.S.C. 5301 et seq.) with respect to Indian tribes: Provided, That the amounts made available under this heading in this title are provided as follows: (1) $400,000,000 shall be for the Native American Housing Block Grants program, as authorized under title I of NAHASDA: Provided, That amounts made available in this paragraph shall be distributed according to the same funding formula used in fiscal year 2021: Provided further, That the amounts distributed through such formula shall be used for new construction, acquisition, rehabilitation, and infrastructure development: Provided further, That in selecting projects to be funded, grantees shall give priority to projects for which contracts can be awarded within 180 days from the date that amounts are made available to the grantees: Provided further, That the Secretary shall notify grantees of their formula allocation not later than 60 days after the date of enactment of this Act: Provided further, That the Secretary shall obligate amounts allocated by formula not later than 120 days after the date of enactment of this Act