its not true that the clutch interlock connector isn't present on auto scs, its there with a dead end plug over it, so when its all said and done everything will work as it did from the factory-if youre converting a late model there will be wiring issues as the factory aode is controlled by the computer-youll need a 5 speed computer, possibly a harness. the rear differential bushings are a must for the conversion-get some high quality poly ones-itll help the new found wheel hop a 5 speed brings with it. if you have an aftermarket alarm installed, or maybe a satelite radio, or even an aftermarket stereo-maybe a one piece fully welded exhaust (AHEM-BRANDON!!!) its going to make the swap a PITA b/c the dashboard should come out to drill the holes for the clutch setup-factory harness unplugs the dash from the rest of the wiring-but when ppl install aftermarket stuff it just makes a jumbled mess-i know this one conversion i did for a gentleman in GROTON (AHEM) was a horror-lol
also, if you have a remote starter its easier to leave the clutch interlock switch out entirely.
if you need any pointers, shoot me an email, ive probably done as many if not more conversions than anyone else-feel free to ask some of the other members (AHEM) about my work/expertise. Mike