What would you do?

I am looking to run 13.0's in any type of heat. The car is a 4spd with 3.23 gears and polyglass tires, I will have to drive 100miles to the track... I figure it will take around 330hp. The way I look at it is if I build the 360 I have to pay for a set of pistons, a crank, and machine work. Then the build has to be efficent enough to make .91 hp per cubic inch, which means I may have to push the compression up some.
If I build the 340 stoker, I have to pay more for the pistons, machine work would be the same, but I already own the rods and crank. Then I only have to worry about making .79hp per cubic inch. Which means I could probably get away with running piss gas.
Nothing is set in stone, just rolling ideas through my head.