Looks like the cam I want to run - Comp XS274S - in a 350 I am building recommends 2 different Comp spring sets and both are larger OD than the stock 1.250" dia seat pockets. The specs on both are 1.430 dia - so how best do you run these springs? My machine shop says its not a good idea to cut the stock pockets that much for fear of hitting water. What have you done? Another guy told me he runs the beehive springs upside down but that sounds crazy.