4cyl clutch pedal vs 5.0 pedal?

[WADS56]

I am having a problem with my clutch I think. When I shift through the gears it will grind, but if I push in the clutch and wait for a few seconds it will shift fine.
I put the car up on jackstands and had a friend push the clutch to the floor when it was running while I was under the car. I could see the clutch disk, and it took a few seconds to stop spinning when he pushed the pedal. Is this normal or should it stop right away? If not that would explain my grinding problem. I talked to the people who did my trans and they said my clutch is not disengaging all the way. They assured me that it is not the trans.
I have a proshifted TKO II, with a Ram 900 11" longstyle clutch and pressure plate, a Ram throughout bearing, a lakewood bellhousing, and a adj pivot ball. The clutch pedal that I am using is the origanal one from my 79 4 cilinder.
The 4 cilinder pedal dosn't have a quadrent of any type on it, the cable conects to the pedal directly. I guess what I am asking is... will the 4 cyl pedal, and the 5.0 pedal pull the cable the same distance when the pedal is down to the floor? The reason I ask is because I have checked everething that there is to check and this is the only thing that I can think of.
Please help this is driving me nuts!