I mounted a Holley 2300 2bbl on a stock 261 intake . I cut open the top of the intake where the carb mounts,did some grinding anmd smoothing, made a carb mounting plate,drilled and tapped some holes to secure it, bolted on a Holley originall from a IHC 266 V-8.A home made bell crank transfers the movement of the stock linkage rod the carb.Rated as a 2bbl, this Holley is 300cfm.Carburates very well,better power , far better throttle response than a Rochester single barrel.
My original set up was a Rochester 2GC 2 bbl on a typical tapered adapter.It ran ok at lower speeds but never performed well at wide open throttle despite jetting changes. I suspect the adapter was causing wierd airflow.
Holley on stock intake
