Swapped to 528 mech cam slowed down

I swapped to a 528 284 Mopar mech cam. I had a Comp 305 525 cam. Car went 107,108 mph with the comp cam. Now with the Mopar cam I am running 102 mph. I set lash at 28/32 like it called for. The valves sound very loose at this setting. I am at a loss for the loss of mph.