I've got a Tremec 3550 in my coupe and love it. And, it's not much more $$ than a new T-5. You can have one to your door for like $1150 from D&D.
It's a fairly straight-forward install, just remember that you'll probably need a different speedo gear than what was in your T-5 as the Tremecs have a different number of teeth on the speedo drive gear than do the T-5s. D&D has a chart on their website to help figure it out.
I also opted for a new clutch and aluminum flywheel setup when I did mine as well as an SFI approved McCleod steel bellhousing.
Good luck,
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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