69 904 Trans swap

I have a 67 barracuda w/273 & 904 trans. I also have a 904 that I removed from my 69 barracuda. My question is has anyone done this swap. From what I understand the front shaft on the 69 torque converter is too big for the pilot hole in the 273 crank. Wanted to see if anyone has tryed having the front shaft on the converter turned to the right size to fit in the 273 crank. Or if there may be some other options so I can make use of the 69 - 904 I have. If anyone is wondering why I am doing this it is because I have a vibration that comes and goes. Everything except the trans has been replaced at least once. (that includes drive shaft, u-joints and even a different rear end) Thanks for any response, Tom