Pacific Overtures - original
Pal Joey - the 1950 album does have Stritch, but later recordings have better quality
There is no "original" of Show Boat since the original production opened in 1927. No production has reproduced the original since then. Songs and scenes have been cut and added galore. And there have been a lot of productions and recordings.
The 1966 is good with an exceptional Barbara Cook and Constance Towers. Again, the 1994 has better recording quality AND has Stritch to boot. In about 1987 there was a complete recording with an all-star cast (but no staging) that incorporated as many different songs and scenes from various productions as could be authenticated. I think it is 3 discs total.
If this were a kind world you'd have enough moola to buy them all and eventually you might.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher