HI I just changed intake and carb on my 65, 404ci and it seems to pop on accel at around 5000 rpms, It seems to me that the more I retard the timing the less it does it. I know the carb is good. Ithing the last time I put a setup on it ,it did the same thing, I think the timing is at around 30 full advanced. Thanks for any help, Im stressed, going racing for the only time this year in the am....