You are going to want a 6:1 pedal ratio
I know Gm's stock master for their LS1 style clutches is 7/8 bore. It sounds to me if you have the correct sized master for the Tilton unit you are running, the ratio is off.
Depending on the amount of room you have, you could weld a tab higher up on the pedal at the ratio you want and connect to that instead of the pedal itself to keep from moving the master up. I believe a 1st gen pedal is 13 inches long so to get a 6:1 ratio the master needs to connect 2 to 2.1 inches below the pivot point.
If the master is sized correctly and the ratio is correct and still having a stiff pedal...you have problems at the clutch and throwout.
Keep us posted
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