I have a 56 Caddy w/ the 365 CID engine single 4 barrel carb. The car idles fine however dies when I accelerate. This happens both under load (ie. in drive) and not underload (ie. in Park). I have recently rebuilt the carb the engine has good compression and the heads were just probfessionally rebuilt. I have a feeling the problem is vacuum but I have no vaccum diagram or might it be something to do with my carb? Any thoughts would be appreciated!