I limp behind a limper with . I have a 1350 stack, and he has a 1270, on a 600 dollar table.

4 to the flop: (24)
Bingo! Checked to me I bet 18, limper calls

Turn (60)
Superbingo! Checked to me, I bet 40, limper calls.

River (140)
He leads 80!! (and he has 1120 behind). I raise to 350. He calls.
Pot is 840. He has for a nice slowplay of the flopped nuts.

Damn that the board paired, I would have taken all his stack other wise. He 850 left.
And Stoney think I should have pushed the river. I am not so sure about a 1290 bet in a 220 pot?

You should have pushed the river for sure because he might have also had a set and just boated up.

Also, by pushing the river you give him a very tough decision with a flush and you basically "train" them to only value bet the river with super strong hands which allows you to fold your 2nd pair/TPWK in the future.