I'd love to believe a set of magnum manifolds would work on a magnum engine in an A-body but until your reply the interwebs have said it's a hard 'no'. Do you have pics of your install(s) and other tech on how you did it, because it would be a game-changer to find out how it can be done. Bottom line is I'd like to avoid having to grind anything, but still more intel is better than less.

This post has pretty detailed intel on all of the interference issues, and is where I got a lot of my initial intel - https://www.forabodiesonly.com/mopa...-an-a-body.109176/page-4#post-1974340834

...I'll probably just grab a set of 340 manifolds and just keep things simple...