Today, dollar for dollar, is the 318 faster than the 340 ???

Most of us are not shopping for cams by the old 'Advertised' duration anymore.
But if you look at say a 284 Adv slider cams @ 0.050" lift and compare it to a race Roller 284 Adv @ 0.050 you will see the @ 0,050 is closer to a 305 Adv slider cam.