3" exhaust is hurting you on the 2.9, drop down to a 2.25" size, you'll find more mid range torque, where you need it. Might want to swap in the 2.3 turbo setup for lighter weight, but swap the turbo for a supercharger for instant boost. Think about going with an IRS from a thunderbird, cougar, or best bet a cobra if you can find one. More weight out back, but benefits are better weight bias and better handling/suspension tuning. Later on I'd add coilovers up front for better tuning as well.
Project is awesome. Progress Looks great so far!
SVT