I resently purchased a set of Indy x heads for my mag 360 the HRS peaple said they flow 269 inlet and 196 exhaust at 600 lift and 263 inlet and 198 exhaust at 500 lift this is with stock valve size for this head which is 1.92 intake and 1.625 exhaust I am going with a bigger intake 2.02 and a 1.62 exhaust slightly smaller how much will my flows vary new valves are 30 degree angle don't know other set