Our 454 had a 600 edelbrock on it when we bought it last winter. I pulled it to install a 750 on it. That 600 was sitting on top of an open spacer staring down at the webbing of the 4 hole intake. There was another post on here with the same mess.

Talk about a cluster ###. I put on the 4 hole adapter but it just isn't right

At least the aluminum would pull some weight, run cooler and hopefully flow slightly better. The big benifit I see is getting rid of that stupid 4 hole entry of
the manifold.

I just don't have the experiance with these bow tie engines yet. I need to pick
some brains that have that experiance.