need a holley #4778 for parts.

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I would look in to new parts. Holleys have a bad habit of warping.

You can get a new Proform base plate for $120. Guaranteed to be flat.
 
Proform is good but theres another--I think its procomp, that stuff is junk. E-bays loaded with it too, hear nothing bu bad talk about how bad the work is. Manifolds don't line up, etc.
 
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