The best way to see how agressive a lobe is, other than a cam doctor or spending time with a degree wheel, is to look at the seat timing numbers, the @.050 number and the @.200 number. Most of the time, you don't get the .200 number but you can ask for it.
I have a cam now that is seat to seat 281*. The @ .050 is 255* and I can't remember the .200 off the top of my head, but it's a fairly fast lobe. So my example sucks because I can't remember the .200 number.
Anyway, if you don't have the .200 number, you can look at the the other two numbers and get a feel for how fast the ramp it.
An example of that is to find a Chrysler lobe that has 255*@.050 you would have to have about 300* of seat timing. My lobe is 19*'s faster just to .050.