[vector1]

I would consider your CID a bit more. I have a 351w and a 351/408, so I wanted to play with the carbs and for some reason wanted the same carb on both, so i'm using a holley 750 ultra hp. I'm probably at the upper limits for the 750 on a 408, I have ran 850's before with no problem on a similar engine. I've adjusted and played with just about everything on these carbs. I think a lot of the carbs are made for heavier vehicles, so when we cruise around in a 2400# car we are using a smaller amount of throttle which affects adjustments, also when we accelerate the amount of throttle can be different, when the pv comes in, etc., jmo of course. After I had the 351 running good, I hooked up the vacuum advance which put the cruising AFR too lean and caused a bit of a problem, so anything can effect your adjustments.