Today, dollar for dollar, is the 318 faster than the 340 ???
My son has a 318 with Mag heads and Mag Eldy airgap, small Voodo FT cam, ProCom headers in a 68 Dart 270 with 3.90:1 8 3/4 and 325 50 22's that will pull the left tire just off the ground. He has not ran it at the track as he need a windshield.
But I have a StupidRoo XT Outback 2.5 Turbo with lots of mods and a ECU tune. It too will lift a tire on launch. Has 4.44 Posi AWD and over 400 HP