my buddy just put one on his stock 5.0 5 speed car and now it feels the same as before except after about 3500. the rpm's are strong all the way through 5500. as far as the heads go i would just go with it. i have a 92 aod car that made 184 stock and then i dyno'd it with afr165, 1.7 roller rockers, and the explorer intake and it made 262 with the stock cam. all pulls were made in 2nd gear. i tried an edelbrock performer 1st and couldnt get it to idle right so i went to the explorer.