I ran into the sam problem when I swithced my tranny with one out of a 84 5.0. I ended up taking off the cover off my 87 and put it on the 84 T-5 and everything fits perfect and works fine. The cover is a ***** to get of so let me know if you need help.
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87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 13.012
Best MPH 104
Best 60' 1.816
Visit my site at:
http://www.geocities.com/cobrar93_2000/MyPage.html