Help identifying Racer Brown camshaft

I bought a NOS Racer Brown STX-22 cam that was advertised as for a big block.

I test fitted it in my block and it seems right but just a tad different than other cams I have.

Could it be a 426 Hemi cam? Would a Hemi cam even fit into a B/RB engine?

It seems like everything lines up good.

If my suspicion is correct and it is a hemi cam, could it still be run in a B/RB motor? I’m aware of the hemi conversion stuff guys did back in the day..

I asked the seller if it was B/RB or Hemi and I was told that it was B/RB.

Can anyone tell me the differences? It’s the exact grind I was looking for but I am just double checking.