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I think a 347 would make sense considering it would bolt in and all the accessory drive pullies and brackets would fit. Then an AOD would bolt to the engine. The only thing that you would need is a different rear crossmember.
 
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A 351W bolts in place to the original C4 and the console fit is unchanged.

However you are thinking of a 5R55S. I think using one of those means a new hump in the floor to clear the much larger transmission. In turn the bigger hump will eliminate the stock console.
 
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