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Just throwing this out there, but a 4 inch crank in a 340 block doesn't care one bit about the rpm drop going into second with a 3.09 gear. Only the tires care



I dont understand what you mean but i cant see how it would be better than the 2.66 first.
Even if a 4 incher there will not be much power at 4300 rpms.
And besides 4 inchers doesnt like to turn high rpms.
Mine is out of power at max 6500 so useing the 3.09 rpms would drop to about 4000 i wouldnt want that.
Im no pro builder but i dont think you can build a motor with that broad power range.