I spent weeks reading about cams before I rebuilt my engine and managed to get really confused, so I rang a well known engine tuning company to have a chat about them. The tech guy basically read out what it said on the website, so wasn't helpful, he knew less than I did !
I then rang V8 Developments and spoke to Acea, who knew what he was talking about. I explained what I wanted the engine for, and he advised me to use his Stealth Cam. The pistons did need to be machined slightly to take the cam though. I was also looking at air flowing the heads (He took mine to Warrior spec), balance the bottom end (got a local racing engine builder to do that bit), fit top hat liners, and a few other bits.
It might be an idea to give him a call if you want a drop in replacement.