What he said. Flat tappet cam cores are just cast metal. Not hardened. You can shatter one by dropping on concrete and they can be bent by dropping the box. Think about a box of parts, with a cam in a box. If UPS drops the big box and the cam is not flat on the bottom, it can bend very easily from it's own weight. That's why they are packaged so carefully. Put the cam in V blocks and use a dial indicator on it. If you can isolate the bend to one spot, you can carefully straighten it by supporting either side of the bend and adding some carefully applied pressure against the bend. Again verifying it's straight with the V blocks and indicator.
I WOULD NOT RUN IT AS IS UNLESS YOU CAN VERIFY ITS NOT THE CAM ITSELF. If you check and the cam is straight, find the tight spot on the cam bearings and scrape them to clearance it until you can turn it with two fingers 360 degrees.