[travis]

Take a good look at your valve springs...if you are using stockers you could have easily broke one or more. I've done it with considerably smaller cams than the xe268 and stock springs. Also, try plugging all of they vaccuum ports on the carb (they are all connected, arent they?)...this takes any indirectly related vac leaks out of the picture. I also agree that it sounds like the timing is quite a ways off or the valves are set too tight, but a nasty vac leak will cause the same symptoms. Are you absolutely sure the plug wires are installed correctly?
Oh, and the ballast thing is very valid also...points ignitions use less voltage than an HEI...sometimes they will run with the reduced voltage, but very poorly.
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375hp 78 Chevy truck
77 Chevy Nova
95 Chevy Lumina 3.4L
and building a 78 Nova

[This message has been edited by travis (edited 08-06-2001).]

 

[travis]

All it takes is one decent backfire to blow the power valve!

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375hp 78 Chevy truck
77 Chevy Nova
95 Chevy Lumina 3.4L
and building a 78 Nova