Do you mean piston to valve clearance or engine clearance? Because those are totally different things. I would think you would need some big valve reliefs in the pistons for that cam/head/rocker combo.
1989 5.0 LX vert. Shift kit, 2500 stall converter, OR X pipe.
1987 Merkur XR4Ti 2.3 turbo. DD, Shift kit