Every 164 I've owned the clutch engages near the floor. I've tried a couple of things to try to get it higher, without success. I had 2 different lenghts of pin from the slave cylinder to the clutch actuating arm. No change. I tried increasing the height of the step on the flywheel slightly. The 164B is running a flywheel that is .003 higher step than was measured when I took it to the machine shop to turn it. It still engages low, but I really think this is the change need to get the clutch to engage higher. I just had the flywheel turned to put on the red 164S engine I'm rebuilding. It is a little more aggressive. It was turned .015 higher than measured. We'll see what happens. My machine shop has done his for other nonAlfa customers. I may end up pulling the transmission and getting the flywheel turned again
I'm not recommending this to anyone. It's experimenting. I'll try it and report the results. There will be immediate results (engages higher or not), and longer term results ( how does it affect clutch wear).
Anyway, I thought it would be interesting to try it.