Rep Power: 804

Well since I bought my car I have worn out the posi. I want to actully spin both wheels while launching so I am looking for a new posi this summer. I am more or less car illeterate and was hoping someone could send me a link to the type of posi and gears I should be looking for. When I got the car the guy listed it had this in it: Currie ford style 9” rear with 31 spline axles / 3.70 gear ratio. Thanks