I just had another thought on your carby from the pic on your other thread...In the pic, I know it was taken at a bit of an angle but is that carby sitting straight up and down when its on both its wheels or is it sitting in an angled postion...Too much angle on these gravity feed type carby's and the motor won't run well as it will getting to much gas resulting in four stroking, poor performance, less throttle response etc. as it is litterally drowning in gas and not enough airflow. for proper combustion.
This could be your actual problem, not the jetting or your need valve C clip adjustment.
It is a must to have these carbs as level as possible.
If it does have an extreme tilt to it, and having performance issues as described and cannot get enough clearance within the frame, and since that stuppy type intake manifold pipe doesn't have a bend in it like the stock one does to make it level, then you will need an offset type of intake manifold like the one in the URL below.
The first one is for the 40mm hole spacing for the hold down bolts, the second one is for the 32mm hole spacing for the hold down bolts...You will need to know if yours is either 40mm or 32mm hole spacing.
40mm Off Set Z Intake Manifold
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