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Hi
I believe that the 401 weighed in at 2760lbs or about 1245kg (another reference says 2786lb which is about 1266kg). Do you know what the front and rear axle weights of the original car were?
Next, do you know the front and rear axle weights of your 'special'?
I suspect that the front/rear springing of your (presumably) light weight special is out of balance and that the rear spring(s) need to be softened, or the front spring stiffened to compensate for the new, lighter chassis, bodywork and different weight distribution.
I also think that if the car was over-steery before moving the engine back will have made the situation worse, not better; a forward weight bias usually gives understeer and reducing that bias, by moving the engine back, would normally reduce understeer.
If you can come up with some numbers it will help to clarify what might be happening.
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