The trick with the 340 is 12s on a reasonable street gear. Most of these builds are 360s and have the street gear with the low end torque. All my 340s needed at least 3.91 and rpm to hit 12s however mine were with old school cams and unported heads big difference in the newer cams. I have a AAR Cuda I want to set up with a stock stroke 340. Will not run the Six Pack.