Idea,
Since you don't seem to be able to come up with any scriptures denying the priesthood to Blacks, perhaps you could explain how that practice was in keeping with the following scriptures (all, as you can see, are from God's word as revealed to latter-day prophets):
D&C 38:26 For what man among you having twelve sons, and is no respecter of them, and they serve him obediently, and he saith unto the one: Be thou clothed in robes and sit thou here; and to the other: Be thou closed in rags and sit thou there – and looketh upon his sons and saith ‘I am just’?
D&C 78:5-6 That you may be equal in the bonds of heavenly things, yea, and earthly things also, for the obtaining of heavenly things. For if ye are not equal in earthly things, ye cannot be equal in obtaining heavenly things.
D&C 38:24-25 And let every man esteem his brother as himself, and practice virtue and holiness before me. And again I say unto you, let every man esteem his brother as himself.
D&C 51:9 And let every man deal honestly, and be alike among this people, and receive alike, that ye may be one, even as I have commanded you.
D&C 88:122 Appoint among yourselves a teaches, and let not all be spokesmen at once; but let one speak at a time and let all listen unto his sayings, that when all have spoken that all may be edified of all, and that every man may have an equal privilege.
D&C 1:20 But that every man might speak in the name of God the Lord, even the Savior of the world…
D&C 4:5And faith, hope, charity and love, with an eye single to the glory of God, qualify him for the work.
D&C 4:3 Therefore, if ye have desires to serve God ye are called to the work…
D&C 6:4 Yea, whosoever will thrust in his sickle and reap, the same is called of God.
D&C 36:4-5 And now this calling and commandment give I unto you concerning all men – That as many as shall come before my servants Sidney Rigdon and Joseph Smith, Jun., embracing this calling and commandment, shall be ordained and sent forth to preach the everlasting gospel among the nations…
D&C 63:57 And again, verily I say unto you, those who desire in their hearts, in meekness, to warn sinners to repentance, let them be ordained unto this power.