FYI - Edelbrock now produces the #2703 manifold with the oil fill tube included.

http://www.summitracing.com/parts/EDL-2703/?image=large

The 7101 Performer RPM manifold has a blanked off provision for the oil fill, but this might be a bit much for a mild 283. This is the manifold I'm running on my 350 with the oil fill.

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I've been using the 600 cfm manual choke model for over 20 years and find them reliable, easy to tune and rebuild.

1960 GMC 1/2-Ton Pickup Truck
In the Gallery
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Now cruising in the Passing Lane