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I would like to replace the crank to get a 39 chainring up front, I just can't climb on the 42 like I did 20 years ago.
My problem is that with the chain on the small chainring it rubs on the large chainring when I shift to the 7th or 8th cog on back.
See if you can lift the chain away from the front of the large chainring or the back of the largest cog.
Yes, the chainring , cog and chain must all be on the same standard or parts will either not engage or will wear out quickly due to excess slop.
The chain should be able to go from the big chainring over the biggest cog, but the rear derailleur should be stretched out almost straight to do it.
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