M H 340 P 38118062

M = Mound Rd DETROIT, MI engine assembly plant
H = 1972 model year
340 = cu.in.
P = premium fuel (is this clear? low compression '72s are usually R = regular fuel ?)
3811 = Mon. 1/3/72 (is this clear? 1st cast crank was scheduled for 3911, Wed. 4/12/72)
8062 = 62nd cast crank 340 assembled