360 Tune Up

My crank pulley is about 7 3/8" diameter and the water pump pulley is about 7" or so. (It's hard to get to with all the belts on.) I am definitely turning the water pump slow, especially with overdrive in my transmission. Looks like the 3418227 pulley would speed me up. Is that correct?

It looks like I have the 225 pulleys....... Go figure......