hiya allan,my names paul,by my sign-in you can probably guess i've got a sunny, sedan though.about that stanza diff,it won't take the amount of horsepower you're putting through it for very long.the way to go is to get an s12 gazelle diff with a h190 centre,these are about the same track as the stanza,are still a bolt in,have big axles,& you can get a large range of axle ratios.i've got a h190 out of a c22 van in mine,but mines only got an a14 with an a15 crank in it at the moment.you can still put the bluebird discs on the diff.