65 dart brakes

65 dart /6, 904, manual brakes, >>>>all new brake hardware, wheel cylinders, master cylinder ( original type single reservoir), new hydraulic hoses, ( old hoses wouldn't pass any fluid), original steel lines, new fuild, bled all air out, but pedal goes 98% way to floor. seems like normal amount of fluid comin out bleeder when i did it, started at right rear and went normal route. can problem be the old steel lines??? back in my youger more finacially secure days, i always bought new repo lines first thing! now i'm financiaaly challenged OLD FART! LOL