I am very green to this venue and I admit I know enough to be dangerous. That being said I do need help. I recieved a m35a2 1968 model with a 1987 model white engine. I recieceved it not running and found that there was a shaft in the injection pump sheared off where the drive goes from horizontal to vertical. I have aquired all the pieces to reassemble the pump but lack some important knowledge. I believe I know how time the pump itself but I don't know how to retime the pump to the motor. If I assemble the pump with the half moon to put the head on and the red mark lined up where do I need to have the motor set crank position and stroke (pump is still on the motor)?