cylinder head question?/AGAIN

I'm not saying I want to go from 450 hp to 550 hp wat I meant was thast the hp range I want to get into after motor is finished I have nothing now but a bare block and crank, I'm going to get my block bored and honed decked haave everything balaced and all. Now I just need to know how to choose a cam , camshafts are foreign to me when it comes to duration lift and centerline and all that.I also want to know will my stock con-rods hold up to that amount of power or will I have to purchase stronger ones??