In reference to mainly 1969 and one 1970 Chevelle.
This is the closest I have found. (below)
I keep a pretty detailed spread sheet as I find information
Ryan
http://ss396registry.macswebs.com/
"Where applicable, RPO L78 cars with RPO L89 aluminum heads will be noted."
This note prompted me to send a message to see if an engine code could be added to this registry?
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1969 Beaumont 350 Auto White Sold
1969 Beaumont 307 Auto Green Sold
1969 Chevelle SS 396-L35 Auto Blue Sold
1969 Oldsmobile Cutlass 'S' Sports Coupe W31