CAN ANY ONE TELL ME IF I CAN PUT 428 VALVES IN THE STANDERED 360/390 HEADS???? ( WITH MACHINE WORK )I THOUGHT THAT I HAD READ IT SOME WHERE ALLONG THE WAY, BUT CANT REMEMBER. I TRADED OFF 8 MOTORS TO A MACHINE SHOP (FOR SOME LABOR COST)THAT WILL BE DOING THE MACHINE WORK FOR ME. BUT OF COURSE I HAVE TO BUY THE PARTS FOR WHAT I WANT DONE. ANY WAYS ANY SUGGESTIONS WOULD BE APPRECIATED. THE WORST CASE IS I BUY ALL NEW SPRINGS (TO HANDLE A BIGGER CAM) VALVES, HARDENED SEATS, PORT MATCHING DEACKIN THE HEADS AND MAYBE THE BLOCK THIS TIME. THANKS SCS