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From afar and without examining the parts:
Camshaft: If the roll spring was put in, it can come out. At worst you could go to a machine shop and have it extracted. If there is a hole in the middle of it, an easy out or similar could probably get enough grip to remove it.
A bigger issue is the end machined to accept the driven end of the distributor shaft AND have it timed properly? A spring pin is normally round and that shape by itself does not create a positive non-rotation receptacle for the distributor shaft.
Throttle body. A slight gap between the plate and body would be normal. The final air for idle is then controlled by the Idle air valve.
No click from switch. In the process of removing, did anything shift? Since the switch will have to be adjusted once installed, release the switch and see if it clicks as it rotates on the leaf shaft. OR, could the switch be a rheostat from a control system that uses variable resistance to determine throttle position instead of open or closed circuits.
This may not be advice per se but may be info enough to help you make a decision.
Duane
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