I am working on a conversion now. The Holley 2305 progreesive 2 bbl is too hard to find. It came in 350 and 500 cfm sizes and tunes like any Holley carb.
The conversion being developed will allow a standard 2300 series carb (350 or 500) to be turned into a proggressive 2 bbl. This would allow for much better tunability and carb sizing.
