78 Aspen engine(318)/transmission (904)

brian6pac said
On each side of the block there are numbers, one side has the casting date the other side has the casting part # and cu.in
They sure made them easy to get to...
Passenger: DN 8 31 77
Driver: 4006730 318 15

Probably under the exhaust manifold.

I can see numbers on the intake and exhaust manifolds?
driver Passenger DN 8 31 77

brian6pac said
On each side of the block there are numbers, one side has the casting date the other side has the casting part # and cu.in

Probably under the exhaust manifold.