I can understand doing the 318 if that what you own, but you hate 360s? Lets see more stroke, bigger bore. What's not to like? If the 360 was a dog a 318 with the same parts will be worse. The problem using 308 heads on a stock short block is low compression, you'll be lucky to get 8-1. That equals dog. I would mill the heads at least .060". Thermo-quad and a stock intake will improve low end grunt.
Doug