You will need a custom built converter designed to give about a 3200 stall speed behind the 327.
You want a "lock up" style converter based on a 245MM case diameter. You don't have near enough gear in the car.
Get some 4.10's and overdrive will have a usfull purpose and the car will be a lot more fun.
The lock up function allows the overdrive to function properly for efficient cruising .
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