I got a set of GT40 cast iron heads for $200 that Im doing some mild porting on. I bought the Trick Flow spring kit for another $150. I found some one to cut new seats for $100.00.Is it worth the money or should I lapp them in and leave it at that. Im putting these on a 140k bottom end so some time in the next few years a new motor is in the plan. Is there a big gain doing the 3 angle seats or should I save my money? My setup will be the stock bottom end with B cam, the GT40's with 1.7 roller rockers,Explorer intake,70MM TB,19lb injectors and a 95gt MAF.