Need some advice to send me in the right direction guys.......Was looking to get the E 303 cam or the TFS1 cam..... Was also thinking about some twisted wedge heads as well.... For durability what kind of roller rockers should I be looking at stud, pedestal, style of arms ect. and what size pushrods should I be looking into...If any body has any good ideas it will help tremendously..... This all will be sitting on a stock block....... Also when you order cylinder heads do they come with springs?