I WAS WONDERING...WHAT INTAKE GASKETS ARE YOU USING...I JUST BUILT A 68 400 ENGINE AND INSTALLED IT IN MY FIREBIRD..MY PROBLEM SOUNDED VERY SIMILAR...I INSTALLED AN EDELBROK INTAKE..BUT I USED THE INTAKE GASKETS FROM A FULL ENGINE REBUILD GASKET KIT...THOSE INTAKE GASKETS JUST DIDNT FIT CORRECTLY...IT SEEMED LIKE A TERRIBLE VACCUUM LEAK...I TRIED EVERYTHING...I CHANGED THE INTAKE GASKETS TO THE RECOMENDED FEL PRO HIGH PERFORMANCE GASKETS AND NOW MY BABY PURRS LIKE A LION...MAYBE THAT WILL HELP...I KNOW IT REALLY SUCKS WHEN YOU BUST YOUR BUTT ON A PROJECT LIKE THIS AND ITS JUST NOT RIGHT........GOOD LUCK
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