what is a good torque convertor

I would say go custom. Off the shelf just doesn't cut it. Especially when you can buy a converter built specifically to your cars engine, power, transmission, rear gear, tire size, weight, etc, etc, etc. It will always run the best. PTC, Dynamic, Custom, TCS, and others do custom. I'm in the middle of getting one speced right now by these various guys. So far PTC comes in sounding the best and the best price. We shall see!