I'm also using a Mcleod setup from one of the Pantera vendors. I'm guessing it may be the same as you have.
I had to go with a long throw slave cylinder from Larry Stock to get enough engagement. I also had a brand-new stock clutch master cylinder go out during the install process and had to move to a Wilwood master. Wilwood does require some light modification.
It took solid half day of adjustments/bleeding to get it to work.
John
#3590