100 horse shot of nos for 440?

Thanks for info I'm hoping someone can tell me approx horsepower this motor will put out before nos
Now replacing rear diff was told Ford ranger was direct replacement so bought one on line found out that leaf spring perches are on top of axle housings and not below like my 66 barracuda and shock mounts are for forward and behind of axle housings not like 66 barracuda where there inline with axle housings just set at angles does anyone know of a diff that is avail and will fit without alot of modifications