Note that the Holley jets work fine if you're running cast iron heads. If you're running Edelbrock heads, the jets won't work because the
oil passage in the head is considerably smaller. For my Edelbrock heads, I tapped the
oil passage, cut a short length of "all thread" and drilled a small hole through the center. I made a screw driver notch in the end and then screwed it down into the tapped
oil passage.
Chris