fuel injection

drove my 505" barracuda w/ the fast 2.0 f.i. around a little yesterday. it seemed to work flawlessly, but was still learning a little. I leaned the fuel ratios down some , it seemed to help. got as rear trans seal leak now. 'QUESTION'' , does any one make a heavy duty seal for a 727 ? all parts ae new, including the slip yoke---bob