Edelbrock P3690585
What's weird is that the LD340 W-2 still has the heat crossover. I believe in the development stages between the T/A head and W-2, there may have been a version with heat crossover. There was a Mopar book/article talking about stages - W-0, W-1, W-2 and Bob Mullin was doing the development work for Chrysler. The article may have been in one of those big paperback books....SA - something??? They did Holley carb books & others as well. I have it, but it's buried somewhere.