milled head .030 (eg) will put the lifters .030 closer to the rockers so youll have to relieve the adjusters that much. Id just wipe the cylinders down with a oiled rag, and wipe the head with a dry lint free rag before installing. torque head in 3 stages inside to outside alternating like the book says and then get the lash .010/.020 before starting the motor. When it heats up, you can relash the valves (running or not, up to your ability) to .010/.020 or whatever the year says. No retorquing is necessary with a Fel-pro. You want clean bolts with a little oil on them when you torque them. Id turn it over with plugs as itll light off pretty fast with gas in the carb. My old slant would kick over immediantly with gas in the carb and the choke set. You wont have to break anything in.