My 59 with 283 does have the offset bolt pattern on the valve covers. I am also thinking that the 265 had the straight exhaust manifolds with the drop at the back. 283 exhaust manifolds were the rams horn style with the drop at the center.


Bruce
Old Toy: Ol' Betsy stock 59 Apache SB Stepside (Gone but not Forgotten)
New Toy: 1962 Impala SS Coupe
The Driver: 1990 Toyota truck