If a noise is coming from the front, it could be the power steering pump, the AC, the alternator or water pump. By removing the belts, you will be able to isolate the problem.
If the noise continues after the belts are off, then it has to be part of the rotating assembly. If you have an oil baffle/deflector under the intake, maybe it is making contact with your push rods. If you have roller lifters, maybe one roller is seized. If you have a double roller timing chain, it may be making contact with the timing cover and or block, you are supposed to grind a little metal off of your block around the cam area where the chain meets the block.

If you installed the torque converter wrong, then it is pushing the crank forward, wearing off your thrust plate/bearing and the crank is making contact with the timing cover.

If you have a hollow flexible hose about two feet long, you should be able to hold one end to your ear and then move the other end around the front of the engine and in this way pin point the noise's origin.