About ten years ago I bought this Holley fuel pressure regulator but can't remember what it was rated at. Searching the web hasn't helped. Maybe one of you can remember this older model?
The only difference with that model is the spring. Buy a repair kit that will include a high and low pressure spring along with a diaphragm, or remove the spring and see what color or marking it has.
Looks like a. 803 type reg . Pretty sure the only difference between low & high pressure is the spring , diaphragm & orifice are the same