Kendal if you do a search on here in the archives there is a lot of information on here about "overheating 454's". Most of these are very old before there were a lot of V10's and 8.1 running around. Most of these posts will say if your fan clutch is bad go with the OEM and stay away from the after market ones. Your description of your problem still remains a mystery, failing fan clutches come on later and not sooner. I would still check out the rest of your cooling system as myself and others have suggested. You have great access to your radiator with the fan removed.
