From your last number, I am GUESSING it is a "marriage" carburetor.

I don't have 6-1658 in my database, but in 1959 Carter was in the 6-1400's

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop