As for the axle all you need is a used ford 9 inch they are bullet proof all you would have to do is rebuild it so you now what was in it ,with that much power this is what i would do 3.73 gears i myself like zoom brand, a full set of heavy duty bearings, 31 spline axles a detroit air locker differential,royal purple gear oil,good axle seals, 3550 u joints,ford racing aluminum drive shaft,don`t forget your driveshaft loop so you never pogo stick your stang, a tremec or if you have money jerico tranny,a goood fly wheel no cast garbage strictly forged only, dual mass kevlar clutch assembley, a fully ajustable clutch,
and for god sakes please don`t forget to upgrade your brakes if you haven`t already. i have seen to many people add power to go faster but forget to upgrade their brakes . don`t forget you need to stop
as for the axle setup i have done this with a 1977 ford pick up running 4.10 gears and was putting at least 700 horse through it with no problems at all, the biggest part is make sure the back lash and pinion depth is set correctly if you do it yourself this can make or break a axle
