Kooyeen, If my comment meant anything , or for whatever it is worth, this is what I understand: These 2 sentences are type 3 Conditional ( past perfect conditional ) . It doesn’t matter where “never” is placed, meaning is the same. You will find # 1 more commonly used.
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"would've never" sounds better than "would never've" to me.You may find it lonely being among the few people who hold this opinion!