Does the engine bog under load or die? The fuel flow is strong ( a little high), so probably not locked. The cap could be partially blocked causing some pressure build up (but probably not). If my pump was dialed up that high my truck would run pretty rich, so maybe take another look at the carb. This still feels like a possible distributor issue (coil, condenser, points etc.). Just because they are new doesn't mean they are good. Did you completely tear the carb down and rebuild?