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According to sources I use, the tilt angle (power angle) of a stock intake manifold is usually between 4-5 degrees. There is a handy little tool that will accurately measure the existing angle while the motor is installed in your car. Go to Home Depot and buy an inexpensive magnetic base angle finder. This gauge reads 0 degrees when it is perfectly level. Place it on the carb mounting surface of the intake and the gauge will read out the angle in degrees that exists. Then you will know how many degrees you need to correct. I assume that you are running Holley carbs and we all know that Holleys like to run level. Further, we all know that Cobra engines are not installed with a significant tilt to the rear in order to avoid dragging the bell housing on the ground.
By the way, an old mechanic once told me that the main reason for the downward tilt of the motor was only to make the transmission tunnel in rear wheel drive vehicles lower especially for the rear passenger compartment.
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Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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