If you want to use a domestic manual tranny, use a t56. They're relatively cheap and after market parts for them are easy to come by since there are hundreds of thousands out there. The Camaro z28, Camaro SS, Firebird Formula, Trans Am, v8 Mustang, Corvette, and Dodge Viper all used these for like 8 years.
And don't listen to anyone who says they can only handle a few hundred horses... T56's are solid, trust me.
And don't listen to anyone who says they can only handle a few hundred horses... T56's are solid, trust me.