318 piston's and quench

Haven't bought a block yet. I've heard the 302 casting's are great for a budget build up. If I used those piston's & left them at 0.067" in the hole would I still have to worry about piston to valve clearance? Would it be a dog with that much quench? I've heard that the KB piston's are more trouble then they are worth, is this true. Also anyone know about 1.500"? Heard they are suppose to be good for torque but I can't find any.