hey everyone i just bought a 1987 vip vindicator 21 foot boat it has a 5.7 with alphaone outdrive. my problem is the prop thats on there is aluminum and its not in very good shape i want to replace it but there are no numbers on it. even if there were im not sure that its what i would want to put back on there so im looking for suggestions as to what diameter and pitch prop i should be running in this boat. thanks for any and all your help