well i would look at what i have in the top end. cam, valve springs to match so no valve float. maybe after market heads (optional) but if you go to crazy with the cam and you gotta whined her to much then you gotta pay a little attention to the bottom end. but to pull to about 6500 on the stock bottom end (assuming its stock) I would check for maybe a cam in ur driving habits with the springs to match. a cam with stock springs is pointless