"So yeah, give me any opinions on this"
I'd try to remove the old spring first.
I haven't replaced a spring, but looking at Haynes, it looks like you need to remove the camshaft. Since (I think) you know how not to remove/install a camshaft, try doing it the other way.
Once off, pull out the follower/shim bucket. Since the spring is broken, you may not need a spring compressor (or to jam rope in the cylinder). Remove the spring keeper and lift out the spring parts. If the piston is up the valve shouldn't fall all the way in.
You can then re-assess the situation to see if you need a spring compressor tool to put in the new spring. eg. You may be able to compress the new spring on the bench and tie it compressed with strong twine?
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1980 245 Canadian B21A with SU carb and M46 trans
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