Ive seen people do a front nose + gfx swap on their 85-90 TA's, but its highly doubtful that it was done. But good luck with it man. And dont rule out that its not a 350, cuz IIRC they only put the L98 in hardtops through the 87-92 third gen era. First mod you should definately do is SFC's. Dont let the body develop stress cracks like my 86 did. Then start with full exhaust/CAI , port the TB, H/C/I, 3.73's and your flying
Go to
www.thirdgen.org, youll find over 30,000 people and more than 500,000 topics on what your looking for. Good luck with it!