Solid flat tappet cam
I think he misunderstood and thought that you were runnin a small block. Have you got rockers yet? Cause if you luck up on some of the ductile iron adjustable rockers what he's talkin about is a good idea on a big block too. I'm not sure there's enough adjuster on any of the rest, but those old Mopar iron rockers have long adjuster screws.