Your very best option for matching one of the newer, very capable front subframes from DSE, Art Morrison, or others is hands down the Lateral Dynamics 3-Link. While Torque arm setups can be applied with a bit less intrusion than the superior 3-Link capability, your choices of a full frame suggest that cutting the car isn't an issue. I see the late model F body in your sig, which is possibly/probably the motivation for you selection of a Torque Arm. Good choice, but a well executed 3-Link is even better. Also a good choice with going with a frame mounted bellcrank style Watt's, the very best option for controlling lateral motion while also eliminating roll moment changes while the suspension moves up and down.
As Frank notes, the added installation compexity associated with executing a full frame into a uni-body car, relative to doing an intelligent set of frame connectors, etc, most likely isn't worth it. If you are planning on a cage, then a full frame is even less important as you now have three dimensions with which to address torsional rigidity. A uni-body car will also almost certainly be lighter too.
To contact Lateral Dynamics, e-mail is best option,
[email protected].
Best of luck with your project!
Mark