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The 351C-4V is notorious for low manifold vacuum, but 12" is on the low end, as is 155# of compression. I would expect to see closer to 175-195# and 15-17" of vacuum. I would contact Edelbrock about whether this manifold is for the 2V heads and can, or even should, be port matched to the 4V heads. Also, do you know what cam is installed in this engine and is it correctly indexed. This could also be the reason for low vacuum and cylinder pressure. :)

'66 A-code Fastback (therapy)
'89 Town Car (SWMBO D'driver)
'87 Caprice (as req'd by Hagerty)
 
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