Edelbrock P3690585

mbaird said
I believe you are correct...
I have new M1 Dual plane W2 on the shelf . I will double check.
My real question was about the runner differences... It has crossed my mind before that the M1 may be a Mopar branded LD.

I'm pretty surethose two manifolds are completely different. I have photos somewhere of the LD W2 manifold, I will try and post.