Driveshaft for 600hp 4sp ?

I ordered mine from Mancini's which is made and shipped from Victory Driveshaft. 3 inch chromemoly with 1350 joints and a mancini forged yolk for my 489 case. Haven't run it yet at the strip and I've got a milder application (511 torque) but it's a 4 speed with a grippy clutch and sticky 28x12.5 Mickey Thompsons.