Dont be suprised if it needs a torque converter. The lock-up clutch is not very stout in them. I've replaced many of them. If you put a converter in it, do yourself a favor and pull the pump and inspect it for wear where the input shaft goes through the stator. A new converter bushing and seal is also a good idea. I would also replace the sealing rings on the input shaft with the updated interlocking style rings for better sealing. You can also drill the relief hole in the boost valve cover to about .070 for better apply pressure to the lock -up clutch. Its a small metal cover on the top side of the valve body held on with 3 T-25 screws with a tiny hole in it.