Will there be a noticeable difference or not. Currently have 350 "881" heads with the 1.94 Valves and 76cc Chambers. I still have my 305HO 58cc, 1.84 valve heads. Switching them wouldn't be a problem but I don't want to do it if there is no noticeable gain. Have u done this? If it matters, I'm running a .447 lift Hyd cam, 1.5 roller rockers. Most recent issue of HotRod makes it sound like a good idea. The better flow and compression outweighs the smaller valves. TIA