I had a similar problem with my hemi6. I went to remove the lifters and they binded in the bores as I tried to lift them out.I managed to get them out after puchasing the proper tool and even then it still required a fair bit of force to remove them. It turned out that the lifters were severly worn, they were dished and had spread where they contacted the cam.
Anyway a lifter removal tool is pretty inexpensive and you should be able to pick one up at your local parts store.
Cheers Jeremy
