no, 93 octane..wonder what the MOST total timing this thing should be able to stand? 9.5:1 440 bored .030 over, stock iron 452 heads, MP 284/484 cam installed 4 degrees advanced at 104. Holley SD intake, hooker 1 7/8 fenderwell headers, 3000 stall convertor. Idles in park at 900 rpm with between 11-12 inches of vacuum and in park at 700 rpm with 8-9 inches of vacuum.