cam bearing issue

Anyone ever have a problem getting cam in last bearing? Im installing a lightly used hemi grind cam in my 440. The engins has about 40k miles. The cam will not go into the last (back of block) bearing without tapping in with a mallet. It will not turn by hand once in. I tried another cam with the same results. The stock cam was tight coming out until it cleared the same bearing. Im thinking new bearing time. Can these be installed while in car?