There has been a few posts on Sb heads. I just went through them. Personal choices, rumors and all out race suggestions. I need a set of SB heads to move my 3300 lbs M body to consistent muffled 12.00's to run a 12.50 index this year. Short block - 360, .030, 520/540 w/ 290 duration, 10.5 compression with a 68cc combustion chamber and a 4.10 rear. Waiting on the final combo before I select a converter. All I need is to select a pair of heads. I have a set of 308's that need a total rebuild, but when you calculate the cost of a rebuild a new set, new iron /aluminum, is about the same. Any thoughts? THX