Did you buy new lines to use on the car for this or did you cut and flare the old line or use feral type fittings for sealing the old lines? If either of the latter two try tightening them up some more and retest twocents scope Can you see fluid leaking out anywhere now after using the line loc?
Let us know what you did to fix this and the results wrench

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)