slant 6 bell housing

That would work .You need a 122 tooth flywheel with the small center hole for the 66 and down crank register. if the motor you are using is a 66 and down . They changed the end of the crank in 67 to a larger size .You can use up to a 10 inch clutch on these flywheels.I know ,I have my 65 Valiant wagon set up like this with a 170 /6 in front. A 63-65 bell is what you need. Here in the US I don't think they sold 66 slant six valiants barracudas and darts with the 4 speed option .