64 Max Wedge

....And yes, "Stage I" 413 (1962 Max Wedge) and 426 (1963, "Stage II" & 64 "Stage III" Max Wedge).

Other than bore size there were'nt many differences between them, mostly subtle changes. 64's had 518 heads, 62 & 63's had 286 heads, 64's used 3705 carbs, 62 & (most) 63's used 3447 carbs. Late 63 & 64 cross ram designs flowed slightly better but looked basically the same as earlier versions (pic above is a 64 stage III).