forged crankshaft

If I go this route, I'm going to use my 904 that's all ready in my 68 vert cuda. I did this before in my 67 that's in my avatar to the left. I t had a 273 and the crank hookes right up. I had to get a new converter, because the car at idle wanted to pull me through the stop lights. Thanks, again any other info is appreciated.