I did build a 69' 340 with the 68', 4-speed cam (purple DC cam). The car runs good when the RPMS are up, but I always wanted to install headers for an improvement. I never wanted to install the TQ set-up, due to the carb bowl leaking or cracking. I do have a Holley single plain on my 72' van with a Purple DC auto cam and it also works awesome. The 340 is a happy motor.