Sounds like you got a pretty complete C-4 setup with spare parts to boot. Those small bellhousing ones are getting hard to find. 450-500hp should be no problem for a stock input shaft and forward drum. If you start getting up to the 550hp+ realm, then consider a hardened input shaft and reinforced forward clutch drum. You may be lucky enough to have some of these parts in the transmission already.
A good way to check for the presence of a hardened input shaft is that most of them have centers drilled on each end, where stock shafts have none.
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