You let one go too eh? A 66 SD is a nice car too.

Tough call. I love them both!

noticed the hubcaps right away.. they do look great on that car!!

Wow !  Lots of comments and questions.

First off;  why trade in an L79  65 SD  for  the 66 SD ?
Way back then  we didn't really know what we it was that we had.  Hindsight is 20/20
The '65  was built for nothing but straight line speed...no frills about that car.  It had no power steering,  no power brakes...hard to manuver in slow traffic..just nice on the highway.  A bit frustrating  as it became known in our area as unbeatable..so no one would come alongside at a light.
So when the beautiful 1966's  came out..I ordered up that red one with black interior  with power steering, power brakes, rear defroster,tach, 4 speed, posi, etc
It sure looked a lot better than the silver 65  with black buckets,  and the 66 buckets were more comfortable to.
My "king of the town" race days were over though.  I took it to a local drag strip and did some runs;  with the 3.08 rear end it would burn rubber (in two black strips)  all through 1st gear, through 2nd gear, and into the beginning of 3rd gear... the small stock tires (735 x 14  2 ply tires)  sure didn't help any...so  at the end of the 1/4 mile..I was clocked at 90 mph  in 14.9 sec  in 3rd gear  reving 5,000 rpm.

I am sure that  3.55 rear end  with slicks and headers would have  helped out a lot...but  back then there was a  young wife and a baby to feed and look after...no money left over for that.

Question about weight in the trunck to give it that look.  No real weight... just a few suitcases and the parking lot was slanted a bit

One day while I was out driving it..a 66 Cheeta pulled up alongside  and we had a little chat, so I did have the experience of seeing one up close when it was new..one of the dark green ones with the 427.  i knew better than to suggest  anything serious from a stop light. 
Also, someone mentioned about the frequency of trading cars back then....
The 65  was my first new car, the 66 the second, a 68 beaumont wagon with 327 PG was the third,  a 70 lemans SW factory order 400 High Comp 4 barrel was the fourth  and after that I just bought second hand cars...my latest being a 2004 GMC Yukon XL  SLT  bought in the fall of '04  with 18,000km  which I love driving   
As you can see,  I have managed to stick and stay with the  Pontiac/GMC brand throughout my life.

Before the '65....I owned a 1959  Pont Parisienne  2 door hdtp  and before that a 1956  American 2 dr hdtp Chieftain   and  a 1950 American 4 dr Chieftian that my dad bought brand new in 1950.

Sorry about mentioning a couple of american pontiac's on this forum site.

i hope that you all will also forgive me for mentioning that i also  owned a few Chevy's
1955 2 dr Bel Air hdtp , a 1956 Bel Air 4 dr hdtp  and a 1957 Bel Air 4 dr hdtp  all of them bought and sold for  between 1,000 and 2,000 dollars.

Back then  nobody knew that they were going to be a collectable item.  They were used everyday as good looking transportation...not show pieces with collector plates

I have a few question for you Super Chief. Did your 66 come from the factory with dual exhaust? If so, do you remember if it had the resonators? Did the tailpipes turn down & exit out back by the bumper? Was it the same system on your 65?

O.K., I'll stop now. Three questions are all I'm allowed.

Very nice car! Thank you for posting the picture and the story behind it.

For the question of the exhaust pipe exiting...... yes, it  came out of the resonator  and bent down and toward the right rear corner...more to the side  than to the back.