I use 1590B's whenever possible. You just need to take into account the overall/effective length of the board + pots, as the board-mounted pots will extend quite a bit beyond the top end of the board.
Your jacks (at least one of them) has to be grounded. You can ground them to the negative terminal of the DC jack or any of the three GND pads of the PCB, including the one at the bottom.