c4 Targa top

My friend just bought a 85 corvette and we were trying to get the targa top off but we couldn't figure it out. We used and allen wrench to get the rear torx bolts out but we couldnt figure out how to get the front loose. If anybody has any input i would appreciate it, thanks.

I also have an 85 Vette, and there are two more torx bolts in the front. They are located in the trim peice on the top of the windshield there are two round holes. You can get the proper tool to do for around $20 on Ebay. If you keep using the allen wrench you'll strip the bolts.
Zak