New master cylinder wont work??

Need some help again.. I have a 70 dart with drum all the way around. Manual brakes also. My old master cylinder was bad so I went down to Napa and got a new one. Wasn't a reman. Took it home and bench bleed it and it worked perfect. Put the new master cylinder on the car and now I'm only getting fluid out the rear reservoir, which is to the front brakes, the pedal sags and now the brakes lights stay on all the time. Has anyone ever had or heard of this problem? :banghead: