It would depend of how the show(s) were originally produced. All were framed inside the "TV Cut-Off" outline (4:3) in the camera's viewfinder. So, it might be hit and miss as to what the full frame would show...set edges, mike booms, beer bottles, etc. Anything shot outside would probably be good, but I would bet I Love Lucy would have lots of stuff that should not be seen. I'd say the same would probably go for Star Trek, plus all the effects shots were produced for 4:3...they did not fill the full 35mm frame.
OK Geek Alert, but I have seen original film version of Star Trek at conventions.
They were produced and directed to be shown in a 4:3 aspect ratio.
Monsters HD maintained original aspect ratios. Old classics were show in 4:3, 1.33:1 1.65:1, and 2.35:1. Black matting was applied to preserve the original aspect ratios when needed. (If they cheated, I never caught it).
I'm not sure what the original aspect ratio of UFO was since it's British and I never heard of it other than on Voom. Flipper seemed to be cropped at the top and bottom to form a 16:9 ratio. I recall Flipper on TV years ago and on Voom you could tell it was zoom/cropped since tops of heads were missing and Flipper's head was gigantic.
Unfortunately, there are no standards for aspect ratio conversion. (I wish there were.) Studios and networks handle that they way they choose.
I believe in preserving the original aspect ratios on everything; 4:3, 1.33:1, 1.65:1, 2.35:1, etc. Especially now since our DVR boxes allow people to choose there own stretch-o-vision or zoom conversions if they wish and most 16:9 TVs can as well.
I love letterboxing and matting when it is preserving aspect ratios (although they need to stay BLACK). I hate SD versions of pan and scan w/ matting on a 16:9 screen.
I'm also disappointed that most of the premium HD channels like HBO and SHOW are cropping 2.35:1 to fit 16:9 TV screens.
I'm not sure why we have to dumb down TV with stretch-o-vision and zoom/cropping. Just so stupid people won't complain about "those annoying black bars".
I would love matted 4:3 1080i HD Original Star Trek, I Love Lucy, and other classics. What is Nick-at-Nite HD going to give us? Upconverted, worn out, pre-historic beta w/ 500 original lines of resolution. A true Nick-at-Nick HD would re-master those classics that were filmed and preserve the original 4:3 aspect ratios.
Anyway, I just realized Voom was the only network I've noticed that saw the 1080i HD content potential in Original TV Classics which were filmed.
That is the opposite of all this upconverted crap we have now (and will probably be living with for a long time since people want/except name-brand-networks with HD logos over true 1080i HD).