You may run into a problem with piston to valve clearance depends on lift and with the flat tops and 64cc chambers it will put you over 10.1 and more than likely lead to detonation. I used Dart Pro1 alu. heads 200cc runners ,72cc chambers on my 383 and my lift is .544/.520 270/276 dur. advertised. I do run premium and no problem runs hard and strong.

Dave