Pop pop on exhaust side
Get the NGK 5s.
Do the idle mixture screws change idle speed or quality...if at all?
You need a lot more timing at idle.....
Here is yet ANOTHER example of how important idle timing is when you increase cam duration/overlap. The cam you have is doing NOTHING to help the situation with all the extra exh duration. It will do little or nothing to improve performance, just make it much more difficult to dial in idle timing, carb idle & off idle carb performance. This is because that extra exh duration adds to the overlap, which is causing your problem.
Get the NGK 5s.
Do the idle mixture screws change idle speed or quality...if at all?
You need a lot more timing at idle.....
Here is yet ANOTHER example of how important idle timing is when you increase cam duration/overlap. The cam you have is doing NOTHING to help the situation with all the extra exh duration. It will do little or nothing to improve performance, just make it much more difficult to dial in idle timing, carb idle & off idle carb performance. This is because that extra exh duration adds to the overlap, which is causing your problem