Ezekiel had to lay a (mini) siege against Jerusalem and had to lay on his left side for 390 days:

Ezk 4:5 – “For I have laid upon thee the years of their iniquity, according to the number of the days, three hundred and ninety days: so shalt thou bear the iniquity of the house of Israel.”

and on his right side for 40 days:

Ezk 4:6 – “And when thou hast accomplished them, lie again on thy right side, and thou shalt bear the iniquity of the house of Judah forty days: I have appointed thee each day for a year.”

Together this made up 430 years, counting from the year that Solomon was threatened by God that his sin would lead to destruction.

390 + 40 = 430 years: 3000 + 430 = 3430 AH.