This is a pretty rare intake nowadays. It is an Edelbrock LD340 and was made to be a direct replacement for the cast iron 340 intake manifold. This one has been modified to use a spread bore Thermoquad carburetor. If you want to run a square board Edelbrock or Holly carburetor, you’ll need to get an adapter. They are pretty cheap. It also had a crack welded up on the heat riser and passenger side of the Plenum. I was told it was run after this work was done, no leaks.