Ron I run the 66 up Moroso 8 qt in my 65 also.Fit perfect.I just took a tiny piece out of the right K because it cleared but was close.I could have gotten by but liked the extra 1/4 I gained.My pan has been on for 12 years street and never came close to hitting even on Ohios bad roads.I used to run a 67 pan when I first had the 440 in.Ran that for over 25 years.Rocky