I have a massive vacuum leak that's making it impossible to tune the carburetor.

The a couple of the intake studs were loose when I received the head for this engine, and I drilled one hole out and re-threaded it, but didn't do that with the other. I should have done both... because as it is, there's a big enough gap at the intake that I could *see* the flame front through the top of the manifold.

I'll get the head drilled out tomorrow and throw on a new gasket, and I'll probably get the exhaust finished up. That should leave me with an engine that runs well.