Ah. AISI9310 / AMS6265 (AMS from memory).
That material carburized makes sense. Your case depth does too, but I'm afraid you're very, very optimistic on the hardness values. It's probably more like HRC ~60 (max), effective case depth is HFC~50. That is more than enough to do the job though (your material spec is good). Is your friend using an actual Rockwell tester, or are those numbers converted from Vickers harndness or something?
As for EN40B or nitrided cams I have to disagree with you there. Commonly cams are nitrided to .004-.008" depth and work just peachy in many applications (including F1). They are flat out as tough as nails. The advantage to nitriding is less deformation. Your core hardness is HRC mid to low 40's on either carburized or nitrided so no difference there. Just get rid of the white layer from nitriding.
I'm more accustmed to nitriding and would go for that myself, but sounds like your 9310 spec is compatible with the RC's buckets so I'd stick to it. 9310 is a nice gear steel.
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