Yes, it is a stepped nose, steel core, hydraulic roller camshaft that GM used with un-touched Vortec heads. It bolts in with zero other changes. Intake lift is 0.452 and exhaust is 0.465 making it compatible with stock springs, retainers, seals, etc. You can re-use your lifters provided they are in good condition even.
What about gas? Does it run fine on 87?
I'm new to this stuff, are there any downsides or concerns I'm not seeing?