Well, another fly in the ointment.
The World Class T5 I bought is from a 93 Camaro, and for some reason, they changed to using the Ford bellhousing pattern that year.
I read that a early 80s AstroVan bellhousing will mate the Ford pattern to GM SB/BB/I6. Also, an early 80's jeep will work (I found one today, but passed on it)...except that you have to use the smaller 153 tooth flywheel and the clutch fork angle is different and there are no bellhousing to crossmember mounts.
All said, I am going to scrap my plans of Camaro WC T5 + S10 T5 tailshaft (about $1200 for both and mods and correct components).
I am going to spend the bucks and just get a Tremec TKO 5 speed. It will be twice the bucks, but heavier duty, brand new, and I can still use my original bellhousing and flywheel.