Vibration right off idle

OK, sounds like you have everything right for your setup then.

Just need to figure where the vibration is coming from.

Hope they sent you the proper Lockup Converter to fit your trans.

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I tried to fit the 90 overdrive converter from this pictured trans into my '76 D100 727 trans, no way it would fit, was a neutral balance converter that I needed to go with 90 318. Had to cut the weights off the 727 converter to make it neutral balance then it worked fine.

Mated up the '90 318 Roller engine to the 727 trans.