how about the turbo 400 has better converter choices? I couldn't even get a converter for my car with the 727 unless i made some concessions.

As for the intermediate aluminum drum your not going to see it in the et but it will put less strain on the clutch pack on the 1-2 shift when that drum has to stop spinning. I don't know how much power your car makes but a pretty much stock pre 1968 turbo 400 will live thru 1200 hp no problems (as long as its a quality rebuild with the correct clearences and clutches). All of the *built* ones just have the bigger sprag and drum the earlir ones had. Also if your going to use a ultra bell on the front of it you need to find a 8 bolt pump case/core to build your trans.

After 12-1500 hp you can buy the good shafts and drums but you still will be cheaper than a lenco anything except the cool factor.