Originally Posted by Roarnracin
... There is a waiting list to have this guy do your motor so I opted to paint my own block.
Hmmm... Bliss? Green? Or? While I do my own assembly anyway, this is a busy time of year for them, and typically a 3-4 week wait for machining, or 6-12 weeks for an assembled engine. I paint mine too.
Your manifold pic looks like the PMS version. Sort-of based on a widened F28 with a pinch more spacing on the carbs. While I have not run one myself (of the specific 351W variety) I don't want to rain on your parade, but feedback from others doing dyno testing indicates a bit of a loss from equivalent single-4 setups. Also, porting is required on them to match your heads, as they are supplied with a centered port to be taken out to what you have (in your case, opening them upwards). The performance is between a Performer and an RPM due to the buried runners. A step-up for your cubes would be the Edel RPM dual quad, also with some good port blending. A downside for the Edel is possible hood clearance issues with it's greater height. Everything is a trade-off, eh?
Oh, and put the carbs on the same direction (both backwards on a Price) and use the progressive linkage for better driveability. Dual quads tend to be a bit sensitive with direct linkage, and have a less linear power response, but it's a personal preference thing for a driver or a good idea for a track car. I love 4x2s, and want to do dual-throttle-body EFI (semi-hidden) version one of these days. Love the looks!