I am about to rebuild a set of GT-40p heads for my 302. Someone, I think Rod, suggested to use the stock parts from a 93 Cobra. What is that exactly? I have a set of Crane 1.72 roller rockers. So basicly I am looking for the Corba intake and exhaust springs? Are the keepers and retainers also the stock 7* or a 10* setup? Any other parts I will need? Thanks.