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I have spent a lot of time working with condensers. I have found that the actual rating in micro-farads is not that important. An engine will run fine over a wide range, the only difference being in the wear (material transfer) on the points.
That being said, a .24 μF is probably a better match to a "modern" coil than one rated at .36 μF. And just about every engine out there is using a "modern" coil, since most of the original coils have deteriorated to the state that they are no longer usable. I believe this is the case even for the vaunted "Skip's coils" that are so widely used.