fuel pressure

Today was the first day I've taken my z out after some drivetrain and suspension work. When I came home I popped the hood to find 2 pools of liquid on the engine block, under the fuel rail. I soaked some of it up with a paper towel and it doesn't smell distinctly like anything in particular...

73 240z with holley 8007 carburetor (i know it's not the best choice for incline 6) , but i was just wondering if i will be needing a 4-9psi fuel pressure regulator, or a low pressure regulator which range from 1-4 psi? there's no mod except for the carburetor and electric fuel pump. here's...