727 or lock up 904

Hi, I am looking for advice and opinions, dangerous I know. I have a 727 and lock up 904 out of a 1991 ram150. My project is a 67 Cuda fb , 340ci around 350hp when done, I have collected sure grip center sections from 2.94, 3.23, 3.55, 3.91 gears. I plan to drive it a lot. Some long cruises to shows, some track time but not much. I know the 727 is stouter but I know the 904 is lighter and saves some HP. I like the idea of the lock up converter I could activate with a switch to save some RPM on highway runs but I would also like to do a reverse manual valve body. It is fun to drive that way, had it on other cars. Car is in paint shop now, planning ahead for assembly. Thanks in advance.