those later model 250 with the integral head are cluttered. you can switch over to regular head and manifold set up and get rid of all the extra junk. you can get as many performence parts as any other 6- cam, head work and headers if you swith heads, different carb, lose the smog, and intake. might check into a cast aluminum valve cover, they work a lot better than cheapo chrome ones they sell now. the stock one will seal better than the cheapos. good luck.