I'm doing it right now, High psi fuel pump (stock is 39 psi), return fuel line, some custom wiring (I did mine with switches) Different shock tower braces, unless you are using the 94-95 intake, You don't have to use the t-5 but i recommend it. You will need a special crossmember or the t-5. Front sump oil pan (original for 289). Wiring harnesses are expensive and hard to find, check out
www.windsor-fox.com they can fab you one up for about $700. You will also have to relocate your battery, which i think everyone should do anyway. oh yeah, you might have to get a specially fabricated driveshaft.
Any questions, e-mail me, grentank@iswt.com