Replacing clutch - help

[rcobra427]

I have a 428 in my car with a 11.5 inch long style clutch. I'm think one of the release fingers might be broken because I've had to adjust the clutch until there is no more free play at all, and you have to push the pedal all the way to the floor before the clutch disengages. Then when you let the pedal up, the clutch grabs right away, just an inch or so from the floor. I had this happen years ago and found a broken finger.
So I want to get rid of the long style pressure plate. I've been looking at several sources, but I have questions. Is there a diaphram style pressure plate that fits in the stock cast iron bell housing, and will work with the stock clutch arm? I know I might have to change the throwout bearing to use a diaphram clutch, but I don't want to change the entire setup if I don't have to. I don't need a monster clutch either, just a nice stock replacement will do.
Thanks,
Rick