I'm a beginner so my opinion probably isn't worth much, but I'd jam here. If he happens to have JT, so be it. It's either that or he is on a draw (spades?). I don't want to see a spade/ten/the board pair on the river plus the villains I play with will usually pay you off here with Qx.
As for sizing - I don't know. I'd probably make it ~230 before the flop but that's about it.