Yep.. One should have at least a 3.55 rear end, we ran it with a 3.91.
Just my ..
I'm probably going to run either 3.91 or 4.10's.
Run a 509 w/ a 4 speed and 4.10's and you'll be close to 11's. 484's and 509's have the same "drivability" so you might as well use the big bump stick.
.. 
