What does it look like?
There are 4 different OEM y-block oil pan types I'm aware of. (so far)
The drain plug faces the rear in all.
With the larger drain plug it's likely a rear-sump style from a Truck or T-Bird.
If it has a half-step, it's from a 'light' truck. (pic #1 below)
With no half-step and a shallow front, it's from a 55/57 T-Bird. pic #2 below (inside view)
In the 3rd picture - from top to bottom:
deep/extra capacity Heavy Duty Truck,
Pickup Truck,
55/57 T-Bird.
4th pic: front sump style for a 'full-sized' car, with a smaller drain plug.