what solid cam is equivalent to a hyd 268 ?

Don't know about the Isky lobe, but he RB stuff is all .904 stuff. I doubt the slightly slower lobe is going to kill what the OP is shooting for.
Just making a general comment. I'm not fond of those shelf cams that an 18 year recommends when you call Summit, Jeg's, Monkey Wards, Sears or Walmart.

RB is a different deal.