So I am picking up my 87 GN on Saturday which has a very built up engine. I don’t have all the specs but it’s been rebuilt with a GN1 striker kit, precision 62mm turbo, custom tune amongst other upgrades that I am supposed to get the sheets for. It has the 200r4 which the current owner says cannot handle the engine. What tranny should I look at to replace the stock one? I apologize for not having more details but I am just trying to get out in front of things here.