Lionel,
I fitted it back in 2008 so no idea of pressure we set it to but yes it was adjustable.
Just had a look at the original photo and the reg is a Holley https://www.holley.com/products/fuel...rs/regulators/
Here's one down to 4.5psi HO12-803 Holley Fuel Pressure Regulator 4 1/2-9 psi | eBay
Colin

