I was looking @ a (used for sale) 16ft X 8ft Diamondback that had its motor & belt drive removed. Originally it had a big block, with a 2 to 1 ratio. My question is, is it going to take a big block to run this boat effectively?? Or would a high horsepower high torque small block do the trick?? How hard is it to convert the motor stand from a belt drive to a gear box?? Last but not least, if a big block is the answer, does a belt drive go better with a big block, and a gear box better with a small block?? I just like the idea of a gear box beause of the options of ratios to pick from........