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Notably, a jack or ten gives you a straight draw as well, making your hand a favorite on the turn. That means you're really looking at 15 outs on turn since there are an additional six jacks or tens that improve your holding, and don't make his boat.

You've got a 40% or so chance to win, and 2 of 6.25 is less than 30%, so you should definitely call. You can even raise the turn if you hit a Jack or Ten (non-spade).

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Hitting a jack or ten on the turn gives you four outs vs. a set, not six, in addition to your flush outs that don't pair the board. Raising for value with a flush draw + inside straight draw when heads-up against a set makes no sense, especially since the opponent will reraise. Also, if the turn is a non-spade jack or ten, you are still only 22.7% to win.