360 292/508 cam fast simple cheap builds

OK guys,got a ? for ya? I have 380 hp crate motor and the cam appears to be 288/292 duro,and 501/513 lift. My question is just how big of a stall converter do I need for this. I was told around 2500 but I see one of you is running 3500/4500 stall. It'll have a 904 behind it. As for gear it all depends on what is recommended.Right now I'd like to run around a 3.50/3.90 range. Thanks in advance for your answers.

Jim