I just went through the same issue when installing my Pro-5.0 on my Tremec. The sealant will hold pretty firm, so you'll really have to pull on it or use a screwdriver at an angle to pry off the old shifter base.
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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