Guys, sorry to dig up an old thread but I am looking at head options for my 415 build, OP - how did you go?
I had a look at the article linked above and took this quote about the "too large 279cc heads":
Like the offerings from Mast Motorsports, the Dr. J's CNC LS3 heads were dedicated castings (from Procomp Motorsport). That the two non-OE castings offered the highest peak flow numbers of our test indicates that the factory heads, even in ported form, can certainly be improved upon. The Dr. J's CNC job on the Procomp Motorsport heads offered peak flow numbers of 374 cfm on the intake and 246 cfm on the exhaust using factory valve sizes. Like the Mast heads, the flow rate of the Dr. J's Procomp heads leveled off and dropped slightly after 0.650 lift (the range of 95 percent of street/strip cams). The peak of 730 hp at 6,900 rpm is the highest output of the LS3 heads equipped with 1.7:1 rockers. This is a perfect example of why we include average power numbers, as despite the big peak power number, the heads from Dr. J's finished behind SDPC and WCCH (albeit by just 1.5 hp and 2 lb-ft) with average power numbers of 580.7 hp and 595.3 lb-ft.
Read more: http://www.hotrod.com/techarticles/e...#ixzz2uPgRAAcq
It seems to me that all these heads will produce great power, the dearest ones might be the best but I guess its up to the buyer whether the extra money is worth the gains.