What prop for a 87 21Z?
 

this is for a friend of mine:

I could use some prop help please..I have a 1987 21z donzi 454 330hp with a alpha drive.The motor says its rated to go to 4600rpms..Currently i have a 19p Quiksliver clever 3 blade on it..Its goes 59mph( gps) at 4200 rpm. I would like to know what i should go with to get my rpms up and speed. I was thinking 19 mirage pluss or 17....any suggestions for this set up? Thanks in advance!

yup 17 mirage or mirage plus. the Turbo 1 works well on my boat too and they are 60% of the price of a mirage.