header to motor mount clearance

I dunno - I bought a 2001 5.2L out of a Ram truck and bolted the original car brackets to the block. The engine dropped right in using the 68 motor mounts. I have read about grinding the block, though. I guess I'm no help. Maybe I put the brackets on the wrong side. LOL
I have an extra 5.2 block and the original 318 block. I'll take some pictures tomorrow and see what is the difference. Maybe that will help. I'll post the pictures tomorrow.