The motorola data sheet I have for the 74LS247, 74LS248, & 74LS249 shows no tail for the 9 in their NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS graphic. However, their truth table contradicts this.
Let me ask this. Would one of them be pin for pin compatable with the 4511?
Going to my parts box now to see if I have any one of them.
Later edit: Bummer. I do not have any of them here.
Later, later edit: Double bummer. Unfortunately, I think the 74LS247-249 do not have a latch.
There appears to be a discrepancy between data sheets then so you would have to get one of each and test yourself or maybe find a website where someone did this already. Some of them might be hard to find anyway. Did you check out the MC part number yet? So you need it to latch too? Well, good luck with it.