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I'll first try to clean them, and then see what to do next.
Speaking about cleaning, I gave a good soak on the parts in strong cleaning agent. Took quite a bit of the grime off.
The VICS looks like it could use a bit of porting and intake radiusing. I was thinking about cleaning all the ports on the manifold, open the VICS chamber, radius the intakes and keep the butterflies. There's quite sharp corners that really interfere with the flow. An obsessed builder might fabricate a radiused insert over the VICS ports to further improve the flow.
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