66_06_stangman

recently installed new clutch, pressure plate, slave cylinder, and master cylinder. Car shifted perfect for about 100miles then it started getting real hard to go into gear. I tried bleeding it again by pumping the clutch that didnt work then i used a vacuum pump and that didnt work either. I took the transmission back down installed a shim behind the slave cylinder bled the line again with the vacuum with the same result. Has anyone ever had this problem and how can i fix it?