[Chiefkey]

Do you still have the transaxle or have you modified the the car to use a regular trans and rear end? If you still have the transaxle you will need to stick with the original engine or modify the crank on your new engine. Another option is to put the 326 crank that is already drilled to accept the torquetube shaft into a 63 389 block as it will have the same dimensions as the 389 crank. I've already been down this road.
JK