Has anyone run this cam XE268 or the XE284. Was wondering if the 284 was too much for the street. Will be running LD340 intake, TTi headers, 3.55 gears with a 727 tranny in a 69 dart with a 69 stock 340( unless I change the pistons). Carb is a holley 670 Avenger, Not sure on tires yet. Any thoughts guys.