I absolutely love the 326 ... all performance considerations aside, it was a rock solid engine that seemed to me to be extremely dimension-ally stable and would go a couple hundred thousand miles easy with the usual replacement of timing chain, lifters etc.
Our 66 when I was a kid .... the freakin oil would come out of that thing after 3000 miles looking like you just poured it out of a can. 20 mpg all day long with a 2 barrel and a powerglide. I'd love to own a another 66 with a 326, 4 bbl, auto, no power anything and a Sears add on AC