From memory, the complete head with cast exhaust weighs around 70 pounds.
Count the 14 head bolts removed and all fuel/vacuum lines are unhooked. Carb linkages off, too.
Now it may be needed to "crack" the seal if it's been on a long while. With your rocker assembly removed, fuel line diverted into a jar and coil lead grounded out, crank the motor two or three times. You'll need the spark plugs in tight for this to work.
Failing this, sharp upwards raps on the underside of the log with a copperfaced hammer should do it - there are no dowel sleeves like an eight had.
Cheers, Adam.