8 3/4 center section

I am looking for a 8 3/4 center section for my dart. I already have a housing and everything, I just need the center section to put in. I am looking for at least 3.55 ratio gears but I could go a bit higher (numerically wise) than that, and preferably a Posi unit.

I am in the Edmonton Alberta Canada area so it would be preferred to have something close to me. But I would be willing to pay for shipping if it was further away.