Watched a whole lot of videos, read a whole lot of posts and rebuilt a SBC 350 by myself. Had a rough idle, found out I was using wrong spark plugs. Have Vortec heads. Changed spark plugs but have another problem. Car will start it will rev around 1200 RPMs for couple minutes and then RPMs drop and eventually die. If I rev it up, it will rev high again and later die. Need some help what could cause this and how to fix it. This is my first engine I built so maybe I missed something or installed something incorrectly. Oh yeah I have a Carter 600 carb and a Street Demon Carb and it does the same thing with both carbs, so I am ruling the carb out. Mahalo for your folks help.
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