Hello I would like to know if anyone can tell me how my 69 lark 35 hp outboard in great condition will power my boat ? She is a 16 foot loan star medallion allumnum hull .The boat came with this motor when I got it but the manual has a 90 hp rateing. I am haveing her all done up and the manual says the motor has fast excellarition and will be great for water sports etc.Boat weights w/motor 750 pounds my buddy says no way she will even plane up others say she will go 20 mph with 4 people and I have a great bet she should plane and go 20 w/2 people what can I expect thanks!