42RH build recommendations

5.9 Magnum usual aftermarket parts Eddy heads mild roller cam air gap intake 750 Demon carb fresh 9:1 shortblock.My question is in regards to the 42 RH trans build for the car. Car will have approximately 350-375 hp. Is it really necessary to go crazy on the trans built or just a good solid stock type complete rebuild to stock specs or possibly red alto clutches and steels with a fresh 2500 stall LU converter and Transgo stg2 shift kit. Car is a Pro Touring type build big suspension and brakes. 95 % street driven 3:55 gears.Looking for opinions from people in the trans buisness or others that have done this trans swap.
Thanks in advance