The 880 was tight in this configuration. Notice the sidewalls on the 220 have little curvature and the bins create good headroom. The 880 did not have this benefit.
GD/Convair might have had a real winner on their hands were it not for the constant delays and interference from Howard Hughes.
In the end, although the PR department loved to trumpet about the "fastest" jets, it didn't really matter.
Speed had pretty much reached it's apex with the first generation of jets and, although delivery was a bit later than the 880's, the 720 came with a family of jets. The 720B was just as fast and the cost of operations by just about any form of measure, was superior. So once the 720 was announced Convair was hard pressed to sell any more 880's.
Because of Hughes constant tinkering almost no two 880's were the same. GE had never hung a version of the 805 on a commercial aircraft and did not have the benefit of experience with the airlines or commercial operations. And like other pure jet engines of the day, they were very smokey. After a clutch of them had taken off the whole airspace along the take off path looked like the mosquito control had driven through.
Convair's attemp to make an even faster version resulted in the 990 which was also financial disaster for Convair.
It was a shame because Convair had a reputation here in the US like Vickers did in Great Britain, of building very sound and reliable airframes. They bowed out of the commercial business for good.
All that being said, I loved travel on the 880's. A DL 880 was one of the first jets I remember flying on, from ATL to MIA. I flew on many of them over the years. I also knew one of DL's 880 check airmen. Somewhere I have an original cockpit ops. manual he gave me. There was something "raw" about flying on the jets back then because creature comforts such as noise and refined flying techniques were not issues that had been tackled, yet.
Needless to say, the 220 is probably a really nice aircraft, but, none of the new stuff has any of the enticement that the old smokies had.