360 Swap in 66 Cuda

I'm going to be swaping motors in my 66 cuda. The Cuda has a 273/904 combo now. I plan on replacing the 273 with a 1978/ 360 motor. Will I be able to bolt this up without any problems with the external balance 360 or do I need a special flex plate? Is there any difference in a torque convertor between an internal and external balanced motor? Thanks, Steve
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