As you see, the spacing of IDA's vs IDF are different enough.
There is another linkage for them and it will tend to twist on the tang more then the IDA does.
The true test of the linkage is to run the car at WOT and see if the engine returns to it's 800rpm idle.
In my case it is 650 and with the non-Weber cam in there, the engine sounds like a marching band. Boom, boom, bad-bad boom boom, etc, etc, etc!
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