I am looking into buying a new carb for my 351W. it is 9.8:1 compression with twisted wedge heads and a .530 lift cam at 220 duration. It has an rpm air gap manifold and headers. I had a 750 edelbrock on it but wasn't satisfied with the tuning at cruise. So now I'm finally going back to holleys. I notice Barry Grant has their carb line with specific recommendations for cam duration and such. They recommended me a 650 speed demon with vacuum secondaries. Their carbs are a bit underrated and often flow more than what they rate them for, so I would like to use a 650 for good tuning. I am using a manual trans with 3.73 rear gears. I can't wait to do power tour next year, so it will see some highway miles as well. some people say the demons only run best at WOT, but seeing this carb is recommended specifically for my cam duration and combo, will I have any problems with that? Tell me what you think.