360 pros & cons vs 318

So since i have to take my head to the machine shop, to get it fixed and i have to dismantle my engine, i was thinking why not go with more cubes? So.... What exactly is so great bout the 360? I understand you get more cubes, longer stroke etc.. How much more power would you get out of a 360 rather than a 318? Is it a ton of more torque, or not really? Lets say stock bottom end for starters. Rpm air gap, my 596 heads milled to 61 cc's & some porting done. Tri-y headers, a 650 holley spreadbore , 2 1/2 exh. x-pipe, 40 series flow's etc.... Will all of this on a 360 block be better off than a 318? Or will i still be in the same neighborhood??.... Or i have a chance of a 413 (out of a car not rv)for 250$ running. I understand piston availability, theres also some 30 over 413 pistons i can get to, for 200$.. What would be the better route? I want more power. My 318 is fun and all, it just doesnt arouse me all that much when i step on it.. Sorry for the rant, guys.. Please help Thanks!!