904 Transmission Fluid Recommendation

Just had my 904 transmission rebuilt with a shift kit and a 2600 stall converter. My 318 is rebuilt putting out 325 HP, I'm looking for trans fluid help. I'm thinking AMSOIL ATF, they also have a Super Shift Race Fluid. Anyone have experience with either brand or a different type. Not planning on racing the car just local shows and a road trip or two. Thanks