Since holley first came out with them have their been many changes to the design? I know a guy who want to sell me one and he says he bought when they frist came out so im wondering if there is anything different that would potentially cause problems or be different than a later one?

Thanks

 

Nothing that will necessarily hurt anything. The older ones didnt have as much material on the top of the ports where the injector bungs are. Other than that i dont know of anything else.