Newbee with 1969 20' SF

[mentalfloss]

First let me thank everyone for a great site. It has been so much help so far. I just purchased a 1969 20' Seacraft. Hull already has been redone. Getting ready to add power. A few questions:
What size outboard? I have a deal on a 2000, 100 HP Yamaha (4 stroke)for $2250 or a brand new E-tec 150 for $10,800. Would like to use the 100 if it will push it. Also have a concern of weight. The center console, and the fuel tank are about 3/4 the way back on the boat. Is this normal?
Here are a few boat porn pics of her:




Also of my 1974 Dorado 22. She is jealous:


Thank yall