Hi, looking for suggestions, I have just removed the Mallory dual point distributor from my 350 and replaced it with an original single point model. Reason for this is that the Mallory had no vacuum advance and I figured after reading up on the forum that for street use the motor would perform better with vacuum advance (which it does). An issue though, sometimes when I step on the gas after coasting the motor will give a single cough and then start to pull normally, this problem diminished a lot when I changed out the two heavy springs that came with the distributor for a light and medium spring, the advance is now all in around 2500 RPM and approx 35 deg BTDC with the vac disconnected and plugged. The motor winds over easily enough and there is no sign of detonation. Idle mixture is set at highest vac which was 17 In Hg.