Is More Flow Better, Is The Smallest Intake Port That Flows The Most The Best

340 is slightly on the small side and a fairly low power with reasonable powerband, never heard anyone say 340 would be better off with smaller port now most start with a 360 thats 20+ cid over a stock 340, ideally at minimum you think you want to start with a head slightly more port then a 340 even for a mild combo nevermind something with some teeth to it. Even a 318 is only slightly smaller than a 340 especially with an overbore, it has heads originally designed for a 273.