It's hard to get a long range level term insurance policy. Any sort of whole life or UL would be a serious rip off and not worth considering in this situation IMHO.
You don't give any indication of your spending needs. As a couple without survivor benefits, you would get $6,289 but if your wife passes away before you the pension income falls by $2,981. If you pass away first, she loses $3,308 of income. Is everybody happy with that outcome?
Taking survivor benefits means that you would initially get $5,660 ($629 less) but you would drop upon the death of the other party much less. How does this match expected living expenses when other assets are considered?
You never mentioned social security or other possible income sources.
The other considerations are health issues and family longevity.
The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane -- Marcus Aurelius