Will the transmission need replaced if he changes the motor?

My dad has a 1964 Ford Galaxie 500. Right now it has a 351W motor. He wants a 390 (original motor to the car). If he was to change the motor, would the transmission need replaced too? The rebuilt transmission has less then 20k miles on it since it was rebuilt.

Yes, he would need a round bellhousing C6. An alternative would be to use an adapter and use an AOD, putting an Overdrive behind that FE engine.

Yes.

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