Re-enforceing the fox platform Thunderbird

[plugngo]

I need to know what would work in strengthening the sub's front and rear !
we are putting a 351 m 400 stroker w 500++ hp.
590 ft lbs torque!
we want to replace the front end sub w/ a mustang gt setup !
the rear will be the turbo coupe sub !

We want to use tubing or square tubing !

How do we mate this up to create a solid stronger frame set !

we will be using the manual pedal setup as well from the turbo coupe setup--and the turbo coupe rear end !

We fear the torque will twist this frame w/o re enforcing it !

Any Ideas ?