Aluminum Parts

Thanks for the input. I have 2 transmissions, one has a cast iron case and tail, the other an aluminum case and cast iron tail. One is going into a DD duster with a 360, car might get a stroked 360 someday, but will be taken to the track every now and then. The other is going into my Ram with a 383, should be close to 500 hp. I was going to use the aluminum case with the 360 and the cast iron one with the 383. Below 450 hp the aluminum case will be OK?