I'm hoping a few of you seasoned veterans can help a new guy out.  To say I'm green is an understatement.  I'm here to learn and any help is appreciated.

I have an '88 20.5 Carrera Elite family cruiser and I love it.  She rides nice and keeps my wife happy.  My issue is I want to make her faster.  I have a great motor builder that used to build all Teague Marine's off shore motors and currently builds all my race motors for my off road program.  He keeps telling me that I need to build the pump before the motor.  He says he can build a big old motor for it but its only going to pump so much water...makes sense.

My question for you guys, is 70mph even reachable in a boat like mine? (she currently runs 55 with just me and 47 with the family and full tanks)  I guess it depends on what I do to it but I'm trying to get a base idea of what I should do before i start tearing into it.  Thanks again and hope to see you guys out on the water.