Guys, I replaced my old Offy manifold with a new Edelbrock 7193 for my 440 Challenger R/T. I didn't use paper gaskets under and above the valley pan, like everyone told me to do. I kept my almost new Holley 700cfm vacuum secondary carb. I now have 2 problems:

1) I have a wicked whistle (vacuum leak?) that seems to be coming somewhere from the passenger side. I have good ears, but it's so loud it kind of obscures where it is coming from. The whistle eases up as you put the engine under load. How can I find where the whistle is coming from. (please don't ignore this question at the expense of the next question).

2) I can't adjust the ignition timing to where I want it because the vacuum can is hitting the manifold. Someone said I have to rotate the distributor clockwise to get the vacuum can away from the manifold, and then move all the plug wires counterclockwise by one wire at a time? How do I do this so I can keep the ignition timing close enough to get the car to start.

Thanks for your help, John