8 3/4 in a 69 Valiant

Nice valiant. I have a 69 v100 too. I am not sure about fittment from truck. You will need to inspect rearend after all you could have to fix the same stuff on the used rearend. You will have to drop srings, new lines possibly, shocks, drive shaft issue. I would fix what you got then when more power is you goal swap it out. i would focus on disc brakes new seatbelts and front suspension uprades to make your ride a little more smooth. Hope that helped.