Gunnie,
not sure if a 450/400 would be able to squeeze past the hump!
I'd have a look at a 'old' classic cartridge that's not a complete oddball here, but is readily available now - something that will keep this old girl kicking on for another 50+ years.
There's plenty of knowledge here mate so keep the ear to the ground so to speak!
Whatever the choice you make, it will certainly make the old girl 'sing' again
cheers
93x64mm