I found a few references to '56 Ford, including the HAMB thread below. Scroll through the BS, look at the pictures and numbers posted... https://www.jalopyjournal.com/forum/threads/8-ford-rear.777596/ .
Pinon IS tapered. Running wheel adaptors for 5 on 5.5 FORD Kelsey wires. 51Dodger - 51 x 40 x 7.5 +/- housing to pinon less gear
Slow in the head, Itchy? '56 Ford passenger car. Here's a photo from a defunct ad... visually identical to your pumpkin, advertised as '55-'56 Crown Victoria. .
Ring gear is Ford. Dave ( Dave's Hotrod ) rebuilt it and said it could be JEEP rear end. All bolted up road test today maybe. Thanks for the feedback!