Here's the circuit I have used many times to interface to the parallel port. It uses the 74HC573 instead of the '373. The two chips work the same, but on the '573, all the inputs are on one side of the chip with the corresponding output directly across from it, I find it more convenient. You would probably need current limiting resistors (330 ohms or so) on the outputs of the '573 in series with the LED's. I've never had a problems by just hooking the LED's directly to the '573 outputs though. Connect +5vdc power to the '573 (pin 20) and the '04 (pin 14). Connect gnd to pin 10 of the '573 and pin 7 of the '04. Also, connect +5vdc to pins 3, 5, 9, 11 & 13 of the '04 to keep them from floating and doing weird stuff.
Have fun & good luck!
JB