Best Stock BB Heads?

I'd also challenge the conclusion that the vast majority of people who do their own on their own equipment can do anything close to what a good shop can. And that's coming from someone with a TCM guide and seat machine and Sioux valve grinder in his garage. The accuracy of the valve job makes or breaks a head. Any head. The talent, experience, and attention to detail required to even equal a floating pilot, cutter-type valve job using stones is very high.
I've gotten 280 with a 2.14 intake on those 346s doing a "full port". It takes time, and experience to get that good enough. And with aftermarket heads being as cheap as they are, and them coming with a valve job equal to or better than the DIY'ers, it's stupid not to get them. But most have sticker shock, and equate the $300 valve job done local to the pro results - which frankly is simply not possible. Or really damn unlikely.