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BTW, when you link your core to your distribution, the connecting link can be L2, L3 or both.
What I wanted to bring to your attention, 4500s can often easily oversubscribe some of their ports. Much depends on the sup and line cards being used. When you want to interconnect a core and distribution, you don't want to use a port that's something like 8:1 oversubscribed. (Further, if you're doing mostly L2, and all traffic L3 has to go to the core, depending on you traffic flows, a single link might have insufficient bandwidth.)
Also from core to distribution, if possible, it's good to avoid single points of failure. So if you only have one link between them, that link's transceivers (if used), the ports connected to, the line card connected to, are all single points of failure. (Of course, with only single sups in each chassis, that too is a single point of failure. From what you've described, from a performance and redundancy standpoint, you might actually be better off using a 4510R, with your two sups [if same model] and line cards - creating a collapsed core/distribution.)
