[MikeMoller]

Ed,

Had similar problem once, the bottom of the intake manifold was just barely bottoming out on the block, and under load the car would not run.Idling and burnouts were fine. Intake manifold gaskets looked compressed. We happened to lay the intake on the motor without any gaskets and noticed the manifold sides were not touching the heads at all, milled some off bottom of the intake on the ends and problem was solved.