if you're starting from square one, the most economical way to make more power is with more cubes. a 360 is cheap, abundant and has an absolute massive amount of less expensive go fast parts.
THAT IS WHY EVERYBODY SAYS BUILD A 360
it takes more compression, more cam, more RPM and better heads to make the SAME power with a 318. which equates to more money, less street manners and likely a shorter lifespan.