My 87 2F has started making a noise that I cant trace. It sounds like it is coming from under the driver wheel well when you are driving down the road. With the hood open, cant tell. I only hear it when the engine reaches 2000 rpm or higher and goes away when you take your foot off the accelerator even above 2000 rpm. Bearings in one of the pumps possibly? I just swapped out the distributor and tuned it up. Starts right up and sounds awesome at idle. Any suggestions appreciated.