Do I need to buy a new torque converter? I have a chevy 350 v8 that Im planning on putting a top end kit on, and I have a Turbo350 transmission. Im not sure if i need a new torque converter.

Depends on a couple things. Are you going to swap the cam to a high lift, long duration cam? If so, you'll need a higher stall speed converter.
Or, was the converter working OK before? Then you don't need a new one unless the first question applies.