rear end help
A 9" ford style rearend will always be a good choice, but can get costly. You may also consider a S60 or 12 bolt rear from Strange that is full aftermarket and designed to be a direct bolt-in.
A set of 31 spline axles and a clutch type posi or a Truetrac diff unit will be good choices for the power you expect to make and the 4L80 trans combo in a street driven car.

