Both can be shown from Scripture:
The Immaculate Conception
The Greek word is Kecharitomene that Luke used in his Gospel (v.1:28), which is the perfect passive participle, indicates a completed action with permanent result. It translates, “completely, perfectly, enduringly endowed with grace.” It is used as a title.
The Angel didn’t say, “Hail Mary, full of grace.” He said, "Hail, Kecharitomene."
The Assumption of Mary
The Bible shows that Mary is the fulfillment of the Ark of the Covenant - she is the Ark of the NEW Covenant.
In Rev. 11:19, we see the Ark in Heaven. In the very next verse (Rev. 12:1), it describes the Ark - a Woman clothed with the sun and the moon and stars at her feet. She gives birth to Christ - the one who will rule all nations with an iron rod.
She is the ONLY creature described in the entire Book of Revelation as having a full body - head to toe.
Any other "false" doctrines you have a problem with??