If your performa came with an 8.5 CD Installer it could be generic enough to use on the 1400. That was always hit or miss on installers, but it worked more than 50% of the time in my experience.
A transfer would not work, as the CPU hardware differs so greatly.
Did you try Half.com? Do some serious digging on Apple's archives? They may have it on FTP.
Pack rat that I am, your query makes me realize it might be worth listing my old install CD's. Got at least one of everything back to 1984. But what if I find another Classic Mac in a dumpster?
Does anyone want a still shrink-wrapped Mac Paint 1.0 manual?
Agh, I spoke too soon. I think 8.5's at a sib's as I've got only 8.0 generic and 8.6.1/G3 here.
But I did come across the original disk and packaging for the very 1st game from Apple, ©1983. Alice through the looking glass. Memories!