383 block with a body bosses

does anyone know which plant the a body blocks were produced at the letter code on My Block is an A which is Lynch Road Detroit Michigan it's a 68 383

the 383 a-bodies were all built at Hamtramck "B"

the 383 castings with the bosses ended up in many other cars, the bosses went unused

if your engine is a D 383HP it is from a Super Bee or Road Runner

The motor mount came from C-Body's anyway, so lots of 383 blocks with those bosses.

thanks for the response guys it is a
D 383hp but it will be going in my 68 Dart thank you guys

Some of the bosses were not tapped