Originally Posted by ChevelleGalaxie500
problem 2 the engine never ran well when i got it it would stall when you came to a stop then start up with no problem so i replaced the carb and 1 vacume line it ran great for about a mile then it didnt have enough power to make it up my steep drive way now car cranks at full throttle make loud squeling noise and never gets over a little over idle and dies after 5 seconds could it be a bad intake manifold gasket leak
Could well be a bad intake leak. Easy replacement on a 307/early 350. Most often caused by incorrect crankcase venting. PCV should plug into one valve cover or screw into oil fill tube. Other valve cover should be vented to the air cleaner with a fiber filter inside the air cleaner housing.
Also be sure to check that the PCV hose isn't cracked and that the ends fit tight on their connections. A cracked PCV hose can create a huge vacuum leak.