Me , i'd go with the Ultradyne.............the earlier that 590 is installed the less top end #s that motor is gonna see , why install on a 100 CL? , surely this is telling you the cam is too big for the motor , installing that cam too early will be fine for the 'seat of the pants' feel , with the comp ratio you're running that 590 will be a dog , much better grinds out there for you're application.