I've got one on my Mustang. I'm using a Tremec 3550 and have BBK equal-length shortie headers w/ off road H-pipe. It fit fine. Bolted right up. No grinding at all. Sounds like long tubes may be a different story.
As Chris said, it's not SFI approved, but I've had one tech guy look at it/ask about it and said that as long as it's a nice thick steel unit, they don't have any problem with it. If I was running 10's though, he might have given me more of a hassle?
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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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