That's a purdy '66! My '66 was a Ventura ("upgraded" Cat). It too, got decent fuel mileage for such a large car, and it handled pretty well.
We now have a '69 Cat wagon with the original 428 still in it. We also have a '63 2-door hardtop. Those are both in pretty nice shape. We have a '62 2-door sedan (coupe, whatever...) that was an NHRA record holder in '65, with a 389-4 bbl. and 3-on-the-tree. Car went low 13s! It's in pretty rough shape, though. Someone sanded all the paint and primer off, then left it in the rain... We're gonna TRY to bring her back.
My uncle and a former father-in-law both bought new '72 4-door cars with the 400. NICE cruisers. A good friend in Tucson had a '71 2-door with 455 in it. Sure surpised muscle cars on I-10!
Cool cars, Catalinas!
Jim