....angle eject?

I have a .356 in AE but have never seen a .375 in AE.

Would love to add a .375 Big Bore to the collection but seems like all of them I see out there are top eject.

Yes. The .375 was still available when the .307 and .356 were introduced and they were all AE by that point. The .375 was dropped shortly thereafter.

They exist. They are HIGHLY collectible, therefore..............they are EXPENSIVE.

Good luck in your search !!!

Yep, they are not cheap, and prices certainly aren't trending downward on levers.

I saw one at a gun show a few years back, $2000 NIB condition iirc. I'd imagine prices have risen considerably since then.