[Gearhead999]

You shouldn't have fuel coming out of the vents.

Sounds like the float is set too high or the needle and seat is stuck.

Open the sight holes and adjust the float level.

The nut on the needle and seat is the adjuster. The screw is the lock. If I remember correctly you turn the the nut clockwise to raise the fuel level.

What is the fuel pump pressure?? If it is too high it will pump right through the carb.

More important tough is. Why isn't it starting?? Does it have spark?? First you have to check that too. Pull plug wire, either hold close to metal on block or install a spark plug and touch it to the block. Turn the engine over and see if you have spark. If not...start there. Check what Frankenstang65 says about the dist. turning first. If it turns, then check the points, cond, rotor, cap and coil. Once you have spark. Then go after the fuel problem.

You ask if you installed the powervalve backward???? It only screws in the metering block one way and the part you turn with a wrench goes toward the throttle body. That is what that large cavity is there for. I don't think the metering block can be installed backwards though. I could be wrong.

Let us know how you make out.