I just saw this on another forum. Looks like his parts are for a phord, but it may be some good info to keep in mind;

"We just got three of the Windsor Super Victor intake manifolds in that we've have ordered for over a year.

The bad news? They're unusable. They missed the dimension on the mating flanges by about .250 total. I suppose we could snot weld them and machine them ourselves.

Be careful with your Edelbrock products. Check them the day you get them. I have a customer that got a Rat Motor manifold that was oval port on one side, the other is rectangular port. I think it's designed for mid range on the drivers side and high rpm on the passenger."