The reason I'm asking is that I've already got a brand new set of self aligning roller rockers which I bought on ebay so I can't return them. At the time I was just planning on doing the Vortec conversion with the Vortec kit that Scoggin Dickey sells, but after reading a few posts bashing Vortec heads, I've changed my mind to getting World S/R Torquers instead since I won't have to buy a new intake and for other reasons. And while we're on the subject of Vortec heads, is there anyone out there that has done the switch? How do you like it? Do you wish you had gone with something like the S/R Torquer heads instead?