Re: Please Help---mercury Outboard Interchange
First you will need to find out if Merc ever made a short shaft V150. Check some serial groups at dougrussell.com and find out. If the did make it, I will bet you will need to change the driveshaft, shiftshaft and midsection.
I recommend you buy a Jackplate instead. You will easily be able to rasie the motor 5"