Yes! With the Quantum go with the med. action at least 6'6. The Shimano is a med. heavy, that will more than do the job. Having some backbone (stiffness) in the rod is necessary to be able to make solid hooksets
You are right, they are not all rated by IM. Fiberglass rods, such as Ugly Stik, Lightnin Rod, will be rated light, med, heavy, etc. Most graphite rods will have the IM rating, but not all will. Can be confusing, I know