Help with T5 problems...

Okay i've been in a big debate as to weather or not the T5 in my stang is world class or not. I've been under the impression that the world class version was started in 85' and up stangs, including the one in my 87' which has a date stamping for october of 86' on it. The problem is that I thought 85'-95' 5.0's had the WC version and it seems that everywhere I go everyone wants to sell a WC rebuild kit for those years. Now I have two reliable sources that say no. One has all the credentials a Master tech could has and has touched hundreds of T5's and says that they didn't start going into stangs until 92' but Borg Warner DID start making it in 85' as un upgrade for race applications. Now my other source is Ford themsleves said the same exact thing. So my question who the hell do I beleive so I can get the right kit so I can finish rebuilding my T5 and get my $%#& car back on the road? Or could it be that (just a hunch) it's not the original tranny and it could be from a 4 banger?

Well it's definitely been apart once (someone went obscenely crazy with the RTV) so no tag. It does have from what I THINK first gear (don't hold it against me) not quite 3 revolutions on the input shaft - 2.95 ish. I say this because the tranny isn't together at the moment . Thanks for the response streetracer, anyone else know anything new or different in addition?

Thanks, i'll check when I am at the shop later this week
I'm thinking I saw all brass. But what about all these rebuild kits stating that they are for 85'-95' 5.0's and they state them being for world class T5's instead?

Okay this is why I started this post, i'm still being confused about it all. ddperformance.com says that all 85'-01' are basically "world class" with 85'-89' being the weakest of them. Now I have a T5 with a build date of october of 86' on it, yet when I ran the numbers with ford here they said for 1) It's not a world class and 2) they didn't start going into stangs until 92'. Then there is the other guy I know (the master tech) that says the same thing. But then there's places like ddperformance.com and so many other places of the like stating the same crap that 85'-01' T5's are the world class models - so who the heck do I believe at this point???