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I sent him an email and linked him to this thread, maybe he will join. I actually don't have much insight to this as i have later generation cars, I just wanted to drop the link.

That's a good find. I think the reason is not quite right but the fix looks right. Who is that guy? I inserted your link so that it clicks through. http://ace240z.com/rt mount.html Not really correct - "As it turns out, the transmissions for a '70 and '71 240z were mounted slightly back than with subsequent years. "

Since its adjustable from 0-100 you can use it with any of the bulbs actually just depends on how much resistance you add, less with the high resistance bulb, more with the low resistance bulb. you just need to adjust the setting to what works. the bulb and the thermistor both vary resistance with heat, the pot is the only thing that once set does not vary. The pot is just a work around for a system that can not stabilize in to a low current steady state while submerged. There is something fundamentally wrong as is, but at this point its got to be either the performance of the thermistor OR for some reason the gas is not cooling the thermistor as designed. The bulb is the only other variable and with the selection you have to choose from that should not be an issue.

All thanks for the help! I got it together! I removed the clutch and re-centered it and I still could not close that gap. It made no sense. So I removed the clutch again and I removed the pilot bushing that I had put on about a month ago. The bushing's inner diameter is slightly too large and does not fit over the spindle. But the plastic tool worked just fine which is why I didn't think of this at first. WTF??!! Luckily as I was searching through my parts boxes I had bought another one on ebay a long time ago and forgot I had it. Once I put the new one in and put the clutch back on the whole job took 5 mins to align. She is ready to go back in! Been a long time coming.

Help is available!