18G -vs- 18V, differences?

["Andrew B. Lundgren" <Lundgren@iname.com>]

What are the differences between the 18V engines and the 18G's?  I know the 
following:

Smog stuff.  (later G's also have the air manifold...)
One year of the 18V has something funky on the water system for the choke I 
believe.
The 18V use the simplex timing chain and gears...

Anything else?

The reason I ask is the '70 parts car I just bought has an 18V in it from a '77 
car if I am correct.  The number is: 18V 890AEL 007...  (forgot the rest...)
My current engine is an 18G D .....  Forgot the rest. 

-
Andrew Lundgren
lundgren@iname.com