Yes I have searched and no one asks direct questions so hard to decipher a answer. 49 Ford flathead, 80lbs compression plus or minus 15 %, new hei dist, new holley 94, stock internals, stock fuel pump. A month ago the engine ran great, then started running rich. That propted my to change the dist/ wires/plugs (which I wanted to for a while), and the carb which I had no history on...it came with the car. Engine starts only with full choke and of course runs rich. I checked all cyl while running with a heat gun and all are firing and heating up evenly. I have changed the plugs, and checked for vacuum leaks. In the upper RPMs one side of the engine the exhaust sound changes to a blap blap blap tone. Almost like a misfire, but I have checked the plug wires at least 20 times now. The car cannot be driven, and instead of asking a million questions I see I have two issues. 1) There is air in the glass fuel bowl. I have checked for vacuum leaks on the suctions side and have found none. I know there is a ck valve in the stock diaphragm pump and its either pushing or pulling. Other than a air supply between the pump and fuel, is there any other reason a pump would have air in it...seems to be at the upper RPMs. The engine runs, but very rich and will not get into the upper rpms due to what sounds like misfire or a fuel supply issue. 2) Also the carb. Its a new single holley 94. haven't checked the jet size or power valve size. Screw in the mixture screws and nothing happens. If anything it runs better. I understand the carb and vacuum/idle circuits, but do not want to disassemble it until I can rule everything else out. If the power valve is too small, I am guessing it will open at idle? Im sure I have left something out, but I am attempting to be clear and concise.