200-4R can be made to handle up to 700HP very easily. Heck they even sell them like that now for 2300 dollars give or take from Streetfighter. It is still a very popular transmission in older cars and restorations. 200-4R is actually a decent transmission if it is rebuilt with aftermarket rebuild kits. I've had them before in my old G-Body cars and first thing I did was have it rebuilt with a shift kit, aftermarket torque convertor, pump and valve body upgrades. Stock they had their issues but even if you just rebuild them with a good quality kit, rebuild the pump and replace the convertor they are really nice. I plan on doing that once I pick up another Cutty. It will get a upgraded 200-4R.