comp 262 vs 268

In layman's terms can someone explain to me the difference between the comp cams extreme energy 262 vs the 268? In terms of power band, idle, performance, etc.... (I have been recommended both by experts, but cant decide)

Subject in question is 70 318 that will have a performer intake, 600 eddelbrock carb, headers and 2.5" x pipe exhaust.

thanks guys