Bill: Thanks for the reply.
Just to show that no good deed goes unpunished.....I changed my terribly cracked fuel lines, too. Must have knocked a bit of dirt loose, 'cos my float needle stuck open, and drained half a tank of gas into my engine over night. Well, it needed an oil change soon anyway. Came out REAL watery on a cold engine. FINALLY got the stuck float bowl screws loose, cleaned everything out, and now it runs great. Oh, and the intake spec is .004-.006, just like the exhaust. Sounds less clattery now.