Feed your individual digits into a few 74LS373 (or 74LS573) latches, kicks the latch pin, have the output from the 393's drive ULM2803's which connect directly to your 7 segment LEDs. Or might not even need the ULN2803, could probably drive the LEDs directly from the '373...
Set everything up, set the output enables high, set the output latches high...
Pull the output enable pin on the first '373 high, put the first number for output on PortA, toggle the first '373 latch pin, pull the first '373 output enable pin low, leave it
Put the output enable pin on the second '373 high, put the second number for output on PortA, toggle the second '373 latch pin, pull the second '373 output enable pin low, leave it. Since you didn't trigger the latch enable pin on the 1st '373, it won't do squat but sit there and output for you...thereby stay sitting still.
Wash, lather, rinse, repeat, all the way down the line...
Or even easier, buy up one of those 'large-ish' backlit LCDs.
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